40920248045175192000
40,920,248,045,175,192,000 is an even composite number composed of five prime numbers multiplied together.
40920248045175192000 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one thousand, seven hundred ninety-two divisors.
Prime factorization of 40920248045175192000:
26 × 33 × 53 × 793 × 7273
(2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 × 5 × 5 × 5 × 79 × 79 × 79 × 727 × 727 × 727)See below for interesting mathematical facts about the number 40920248045175192000 from the Numbermatics database.
Names of 40920248045175192000
- Cardinal: 40920248045175192000 can be written as Forty quintillion, nine hundred twenty quadrillion, two hundred forty-eight trillion, forty-five billion, one hundred seventy-five million, one hundred ninety-two thousand.
Scientific notation
- Scientific notation: 4.0920248045175192 × 1019
Factors of 40920248045175192000
Divisors of 40920248045175192000
- Number of divisors d(n): 1792
-
Complete list of divisors:
1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 32 36 40 45 48 50 54 60 64 72 75 79 80 90 96 100 108 120 125 135 144 150 158 160 180 192 200 216 225 237 240 250 270 288 300 316 320 360 375 395 400 432 450 474 480 500 540 576 600 632 675 711 720 727 750 790 800 864 900 948 960 1000 1080 1125 1185 1200 1264 1350 1422 1440 1454 1500 1580 1600 1728 1800 1896 1975 2000 2133 2160 2181 2250 2370 2400 2528 2700 2844 2880 2908 3000 3160 3375 3555 3600 3635 3792 3950 4000 4266 4320 4362 4500 4740 4800 5056 5400 5688 5816 5925 6000 6241 6320 6543 6750 7110 7200 7270 7584 7900 8000 8532 8640 8724 9000 9480 9875 10665 10800 10905 11376 11632 11850 12000 12482 12640 13086 13500 14220 14400 14540 15168 15800 17064 17448 17775 18000 18175 18723 18960 19629 19750 21330 21600 21810 22752 23264 23700 24000 24964 25280 26172 27000 28440 29080 29625 31205 31600 32715 34128 34896 35550 36000 36350 37446 37920 39258 39500 42660 43200 43620 45504 46528 47400 49928 52344 53325 54000 54525 56169 56880 57433 58160 59250 62410 63200 65430 68256 69792 71100 72000 72700 74892 75840 78516 79000 85320 87240 88875 90875 93615 94800 98145 99856 104688 106650 108000 109050 112338 113760 114866 116320 118500 124820 126400 130860 136512 139584 142200 145400 149784 156025 157032 158000 163575 168507 170640 172299 174480 177750 181750 187230 189600 196290 199712 209376 213300 216000 218100 224676 227520 229732 232640 237000 249640 261720 266625 272625 280845 284400 287165 290800 299568 312050 314064 316000 327150 337014 341280 344598 348960 355500 363500 374460 379200 392580 399424 418752 426600 436200 449352 459464 468075 474000 490725 493039 499280 516897 523440 528529 533250 545250 561690 568800 574330 581600 599136 624100 628128 632000 654300 674028 682560 689196 697920 711000 727000 748920 780125 785160 817875 842535 853200 861495 872400 898704 918928 936150 948000 981450 986078 998560 1033794 1046880 1057058 1066500 1090500 1123380 1137600 1148660 1163200 1198272 1248200 1256256 1308600 1348056 1378392 1404225 1422000 1435825 1454000 1479117 1497840 1550691 1560250 1570320 1585587 1635750 1685070 1706400 1722990 1744800 1797408 1837856 1872300 1896000 1962900 1972156 1997120 2067588 2093760 2114116 2133000 2181000 2246760 2297320 2340375 2453625 2465195 2496400 2584485 2617200 2642645 2696112 2756784 2808450 2844000 2871650 2908000 2958234 2995680 3101382 3120500 3140640 3171174 3271500 3370140 3412800 3445980 3489600 3594816 3675712 3744600 3925800 3944312 4135176 4212675 4228232 4266000 4307475 4362000 4437351 4493520 4537207 4594640 4680750 4756761 4907250 4930390 4992800 5168970 5234400 5285290 5392224 5513568 5616900 5688000 5743300 5816000 5916468 5991360 6202764 6241000 6281280 6342348 6543000 6740280 6891960 7021125 7179125 7395585 7489200 7753455 7851600 7888624 7927935 8270352 8425350 8456464 8532000 8614950 8724000 8874702 8987040 9074414 9189280 9361500 9513522 9814500 9860780 9985600 10337940 10468800 10570580 10784448 11027136 11233800 11486600 11832936 12325975 12405528 12482000 12684696 12922425 13086000 13213225 13312053 13480560 13611621 13783920 14042250 14270283 14358250 14791170 14978400 15506910 15703200 15777248 15855870 16540704 16850700 16912928 17064000 17229900 17448000 17749404 17974080 18148828 18378560 18723000 19027044 19629000 19721560 20675880 21063375 21141160 21537375 22186755 22467600 22686035 22973200 23665872 23783805 24651950 24811056 24964000 25369392 25844850 26172000 26426450 26624106 26961120 27223242 27567840 28084500 28540566 28716500 29582340 29956800 31013820 31406400 31554496 31711740 33081408 33701400 33825856 34459800 35498808 36297656 36977925 37446000 38054088 38767275 39258000 39443120 39639675 40834863 41351760 41753791 42126750 42282320 43074750 44373510 44935200 45372070 45946400 47331744 47567610 49303900 49622112 49928000 50738784 51689700 52344000 52852900 53248212 53922240 54446484 55135680 56169000 57081132 57433000 59164680 61629875 62027640 63423480 64612125 66066125 66560265 67402800 68058105 68919600 70997616 71351415 72595312 73955850 74892000 76108176 77534550 78516000 78886240 79279350 81669726 82703520 83507582 84253500 84564640 86149500 88747020 89870400 90744140 91892800 94663488 95135220 98607800 99244224 101477568 103379400 105705800 106496424 108892968 110933775 112338000 113430175 114162264 114866000 118329360 118919025 122504589 123259750 124055280 125261373 126846960 129224250 132132250 133120530 134805600 136116210 137839200 141995232 142702830 145190624 147911700 149784000 152216352 155069100 157032000 157772480 158558700 163339452 165407040 167015164 168507000 169129280 172299000 177494040 181488280 184889625 190270440 193836375 197215600 198198375 204174315 206758800 208768955 211411600 212992848 217785936 221867550 224676000 226860350 228324528 229732000 236658720 237838050 245009178 246519500 248110560 250522746 253693920 258448500 264264500 266241060 269611200 272232420 275678400 283990464 285405660 290381248 295823400 304432704 310138200 317117400 326678904 332801325 334030328 337014000 340290525 344598000 354988080 356757075 358439353 362976560 369779250 375784119 380540880 384240583 387672750 394431200 396396750 408348630 413517600 417537910 422823200 425985696 435571872 443735100 449352000 453720700 456649056 459464000 473317440 475676100 490018356 493039000 496221120 501045492 507387840 516897000 528529000 532482120 544464840 554668875 567150875 570811320 591646800 594595125 612522945 620276400 626306865 634234800 653357808 665602650 668060656 674028000 680581050 689196000 709976160 713514150 716878706 725953120 739558500 751568238 761081760 768481166 775345500 788862400 792793500 816697260 827035200 835075820 845646400 851971392 871143744 887470200 907441400 913298112 951352200 980036712 986078000 1002090984 1020871575 1033794000 1043844775 1057058000 1064964240 1075318059 1088929680 1109337750 1127352357 1134301750 1141622640 1152721749 1183293600 1189190250 1225045890 1240552800 1252613730 1268469600 1306715616 1331205300 1336121312 1348056000 1361162100 1378392000 1419952320 1427028300 1433757412 1451906240 1479117000 1503136476 1522163520 1536962332 1550691000 1585587000 1633394520 1664006625 1670151640 1701452625 1774940400 1783785375 1792196765 1814882800 1878920595 1902704400 1921202915 1960073424 1972156000 2004181968 2041743150 2067588000 2087689550 2114116000 2129928480 2150636118 2177859360 2218675500 2254704714 2268603500 2283245280 2305443498 2366587200 2378380500 2450091780 2481105600 2505227460 2536939200 2613431232 2662410600 2672242624 2722324200 2854056600 2867514824 2958234000 3006272952 3062614725 3073924664 3101382000 3131534325 3171174000 3225954177 3266789040 3298549489 3328013250 3340303280 3402905250 3458165247 3549880800 3567570750 3584393530 3629765600 3757841190 3805408800 3842405830 3920146848 3944312000 4008363936 4083486300 4135176000 4175379100 4228232000 4259856960 4301272236 4355718720 4437351000 4509409428 4537207000 4566490560 4610886996 4756761000 4900183560 5010454920 5104357875 5219223875 5324821200 5376590295 5444648400 5636761785 5708113200 5735029648 5763608745 5916468000 6012545904 6125229450 6147849328 6202764000 6263068650 6342348000 6451908354 6533578080 6597098978 6656026500 6680606560 6805810500 6916330494 7099761600 7135141500 7168787060 7259531200 7515682380 7610817600 7684811660 7840293696 8016727872 8166972600 8350758200 8602544472 8874702000 8960983825 9018818856 9074414000 9221773992 9394602975 9513522000 9606014575 9677862531 9800367120 9895648467 10020909840 10208715750 10374495741 10438447750 10649642400 10753180590 10889296800 11273523570 11416226400 11470059296 11527217490 11832936000 12025091808 12250458900 12295698656 12405528000 12526137300 12684696000 12903816708 13067156160 13194197956 13312053000 13361213120 13611621000 13832660988 14270283000 14337574120 15031364760 15313073625 15369623320 15657671625 16129770885 16333945200 16492747445 16701516400 17205088944 17290826235 17749404000 17921967650 18037637712 18148828000 18443547984 18789205950 19027044000 19212029150 19355725062 19600734240 19791296934 20041819680 20417431500 20748991482 20876895500 21299284800 21506361180 21778593600 22547047140 22832452800 22940118592 23054434980 24050183616 24500917800 24591397312 25052274600 25807633416 26388395912 26624106000 26882951475 27223242000 27665321976 28183808925 28540566000 28675148240 28818043725 29686945401 30062729520 30355006057 30626147250 30739246640 31315343250 32259541770 32667890400 32985494890 33403032800 34410177888 34581652470 35498808000 35843935300 36075275424 36297656000 36887095968 37578411900 38054088000 38424058300 38711450124 39201468480 39582593868 40083639360 40834863000 41497982964 41753791000 43012722360 44804919125 45094094280 46108869960 46973014875 48030072875 48389312655 49001835600 49478242335 50104549200 51615266832 51872478705 52776791824 53248212000 53765902950 54446484000 55330643952 56367617850 57081132000 57350296480 57636087450 59373890802 60125459040 60710012114 61252294500 61478493280 62630686500 64519083540 65335780800 65970989780 66806065600 68820355776 69163304940 71687870600 72150550848 73774191936 75156823800 76848116600 77422900248 79165187736 80648854425 81669726000 82463737225 82995965928 83507582000 86025444720 86454131175 89060836203 89609838250 90188188560 91065018171 92217739920 93946029750 96060145750 96778625310 98003671200 98956484670 100209098400 103230533664 103744957410 105553583648 106496424000 107531805900 108892968000 110661287904 112735235700 114162264000 114700592960 115272174900 118747781604 120250918080 121420024228 122504589000 122956986560 125261373000 129038167080 131941979560 134414757375 138326609880 140919044625 143375741200 144090218625 148434727005 150313647600 151775030285 153696233200 154845800496 158330375472 161297708850 163339452000 164927474450 165991931856 167015164000 172050889440 172908262350 178121672406 179219676500 180376377120 182130036342 184435479840 187892059500 192120291500 193557250620 196007342400 197912969340 200418196800 206461067328 207489914820 211107167296 215063611800 221322575808 225470471400 230544349800 237495563208 241946563275 242840048456 245009178000 247391211675 250522746000 258076334160 259362393525 260585409631 263883959120 268829514750 273195054513 276653219760 281838089250 286751482400 288180437250 296869454010 300627295200 303550060570 307392466400 309691600992 316660750944 322595417700 326678904000 329854948900 331983863712 334030328000 344101778880 345816524700 356243344812 358439353000 360752754240 364260072684 368870959680 375784119000 384240583000 387114501240 395825938680 403244272125 412318686125 414979829640 430127223600 432270655875 445304181015 450940942800 455325090855 461088699600 474991126416 483893126550 485680096912 490018356000 494782423350 501045492000 516152668320 518724787050 521170819262 527767918240 537659029500 546390109026 553306439520 563676178500 573502964800 576360874500 593738908020 601254590400 607100121140 614784932800 619383201984 633321501888 645190835400 659709897800 663967727424 691633049400 712486689624 716878706000 728520145368 742173635025 751568238000 758875151425 768481166000 774229002480 781756228893 791651877360 806488544250 819585163539 824637372250 829959659280 860254447200 864541311750 890608362030 901881885600 910650181710 922177399200 949982252832 967786253100 971360193824 980036712000 989564846700 1002090984000 1032305336640 1037449574100 1042341638524 1055535836480 1075318059000 1092780218052 1106612879040 1127352357000 1152721749000 1187477816040 1209732816375 1214200242280 1236956058375 1290381670800 1296811967625 1302927048155 1319419795600 1365975272565 1383266098800 1424973379248 1433757412000 1457040290736 1484347270050 1503136476000 1517750302850 1536962332000 1548458004960 1563512457786 1583303754720 1612977088500 1639170327078 1649274744500 1659919318560 1720508894400 1729082623500 1781216724060 1803763771200 1821300363420 1844354798400 1899964505664 1935572506200 1942720387648 1979129693400 2074899148200 2084683277048 2150636118000 2185560436104 2226520905075 2254704714000 2276625454275 2305443498000 2345268686679 2374955632080 2398045478503 2419465632750 2428400484560 2473912116750 2580763341600 2593623935250 2605854096310 2638839591200 2731950545130 2766532197600 2849946758496 2867514824000 2914080581472 2968694540100 3006272952000 3035500605700 3073924664000 3096916009920 3127024915572 3166607509440 3225954177000 3278340654156 3298549489000 3319838637120 3458165247000 3562433448120 3642600726840 3710868175125 3794375757125 3871145012400 3908781144465 3958259386800 4097925817695 4149798296400 4169366554096 4301272236000 4371120872208 4453041810150 4509409428000 4553250908550 4610886996000 4690537373358 4749911264160 4796090957006 4838931265500 4856800969120 4947824233500 5161526683200 5187247870500 5211708192620 5277679182400 5463901090260 5533064395200 5699893516992 5828161162944 5937389080200 6071001211400 6254049831144 6451908354000 6514635240775 6556681308312 6597098978000 6829876362825 6916330494000 7035806060037 7124866896240 7194136435509 7285201453680 7421736350250 7588751514250 7742290024800 7817562288930 7916518773600 8195851635390 8299596592800 8338733108192 8602544472000 8742241744416 8906083620300 9018818856000 9106501817100 9221773992000 9381074746716 9499822528320 9592181914012 9677862531000 9713601938240 9895648467000 10374495741000 10423416385240 10927802180520 11132604525375 11383127271375 11726343433395 11874778160400 11990227392515 12142002422800 12508099662288 12903816708000 13029270481550 13113362616624 13194197956000 13659752725650 13832660988000 14071612120074 14249733792480 14388272871018 14570402907360 14843472700500 15177503028500 15484580049600 15635124577860 15833037547200 16391703270780 16599193185600 16677466216384 17484483488832 17812167240600 18213003634200 18762149493432 19184363828024 19355725062000 19543905722325 19791296934000 20489629088475 20748991482000 20846832770480 21582409306527 21855604361040 22265209050750 22766254542750 23452686866790 23749556320800 23980454785030 24284004845600 25016199324576 25807633416000 26058540963100 26226725233248 26388395912000 27319505451300 27665321976000 28143224240148 28499467584960 28776545742036 29140805814720 29686945401000 30355006057000 31270249155720 32573176203875 32783406541560 34149381814125 35179030300185 35624334481200 35970682177545 36426007268400 37524298986864 38368727656048 38711450124000 39087811444650 39582593868000 40979258176950 41497982964000 41693665540960 43164818613054 43711208722080 44530418101500 45532509085500 46905373733580 47499112641600 47960909570060 48568009691200 50032398649152 52117081926200 52453450466496 54639010902600 56286448480296 57553091484072 58631717166975 59373890802000 59951136962575 60710012114000 62540498311440 64747227919581 65146352407750 65566813083120 68298763628250 70358060600370 71248668962400 71941364355090 72852014536800 75048597973728 76737455312096 77422900248000 78175622889300 79165187736000 81958516353900 82995965928000 83387331081920 86329637226108 87422417444160 89060836203000 91065018171000 93810747467160 95921819140120 97719528611625 102448145442375 104234163852400 107912046532635 109278021805200 112572896960592 115106182968144 117263434333950 118747781604000 119902273925150 121420024228000 125080996622880 129494455839162 130292704815500 131133626166240 136597527256500 140716121200740 142497337924800 143882728710180 145704029073600 150097195947456 153474910624192 156351245778600 163917032707800 172659274452216 175895151500925 178121672406000 179853410887725 182130036342000 187621494934320 189445592801737 191843638280240 195439057223250 204896290884750 208468327704800 215824093065270 218556043610400 225145793921184 230212365936288 234526868667900 237495563208000 239804547850300 242840048456000 250161993245760 258988911678324 260585409631000 262267252332480 273195054513000 281432242401480 287765457420360 293158585834875 299755684812875 312702491557200 323736139597905 327834065415600 345318548904432 351790303001850 356243344812000 359706821775450 364260072684000 375242989868640 378891185603474 383687276560480 390878114446500 409792581769500 416936655409600 431648186130540 437112087220800 450291587842368 460424731872576 469053737335800 479609095700600 517977823356648 521170819262000 539560232663175 546390109026000 562864484802960 568336778405211 575530914840720 586317171669750 599511369625750 625404983114400 647472279195810 655668130831200 690637097808864 703580606003700 712486689624000 719413643550900 728520145368000 750485979737280 757782371206948 767374553120960 781756228893000 819585163539000 863296372261080 879475757504625 899267054438625 938107474671600 947227964008685 959218191401200 1035955646713296 1042341638524000 1079120465326350 1092780218052000 1125728969605920 1136673556810422 1151061829681440 1172634343339500 1199022739251500 1250809966228800 1294944558391620 1311336261662400 1381274195617728 1407161212007400 1438827287101800 1515564742413896 1563512457786000 1618680697989525 1639170327078000 1705010335215633 1726592744522160 1758951515009250 1798534108877250 1876214949343200 1894455928017370 1918436382802400 2071911293426592 2084683277048000 2158240930652700 2185560436104000 2251457939211840 2273347113620844 2302123659362880 2345268686679000 2398045478503000 2589889116783240 2697801163315875 2814322424014800 2841683892026055 2877654574203600 3031129484827792 3127024915572000 3237361395979050 3278340654156000 3410020670431266 3453185489044320 3517903030018500 3597068217754500 3752429898686400 3788911856034740 3836872765604800 4143822586853184 4316481861305400 4546694227241688 4690537373358000 4736139820043425 4796090957006000 5115031005646899 5179778233566480 5395602326631750 5628644848029600 5683367784052110 5755309148407200 6062258969655584 6254049831144000 6474722791958100 6556681308312000 6820041340862532 6906370978088640 7035806060037000 7194136435509000 7577823712069480 8093403489947625 8525051676078165 8632963722610800 9093388454483376 9381074746716000 9472279640086850 9592181914012000 10230062011293798 10359556467132960 10791204653263500 11257289696059200 11366735568104220 11510618296814400 12124517939311168 12949445583916200 13640082681725064 14071612120074000 14208419460130275 14388272871018000 15155647424138960 16186806979895250 17050103352156330 17265927445221600 18186776908966752 18762149493432000 18944559280173700 19184363828024000 20460124022587596 20719112934265920 21582409306527000 22733471136208440 23680699100217125 25575155028234495 25898891167832400 27280165363450128 28143224240148000 28416838920260550 28776545742036000 30311294848277920 32373613959790500 34100206704312660 34531854890443200 36373553817933504 37889118560347400 40920248045175192 42625258380390825 43164818613054000 45466942272416880 47361398200434250 51150310056468990 51797782335664800 54560330726900256 56286448480296000 56833677840521100 57553091484072000 60622589696555840 64747227919581000 68200413408625320 71042097300651375 75778237120694800 81840496090350384 85250516760781650 86329637226108000 90933884544833760 94722796400868500 102300620112937980 103595564671329600 109120661453800512 113667355681042200 127875775141172475 129494455839162000 136400826817250640 142084194601302750 151556474241389600 163680992180700768 170501033521563300 172659274452216000 181867769089667520 189445592801737000 204601240225875960 213126291901954125 227334711362084400 255751550282344950 258988911678324000 272801653634501280 284168389202605500 303112948482779200 327361984361401536 341002067043126600 378891185603474000 409202480451751920 426252583803908250 454669422724168800 511503100564689900 517977823356648000 545603307269002560 568336778405211000 639378875705862375 682004134086253200 757782371206948000 818404960903503840 852505167607816500 909338845448337600 1023006201129379800 1136673556810422000 1278757751411724750 1364008268172506400 1515564742413896000 1636809921807007680 1705010335215633000 2046012402258759600 2273347113620844000 2557515502823449500 2728016536345012800 3410020670431266000 4092024804517519200 4546694227241688000 5115031005646899000 6820041340862532000 8184049609035038400 10230062011293798000 13640082681725064000 20460124022587596000 40920248045175192000
- Sum of all divisors σ(n): 152266051063805952000
- Sum of proper divisors (its aliquot sum) s(n): 111345803018630760000
- 40920248045175192000 is an abundant number, because the sum of its proper divisors (111345803018630760000) is greater than itself. Its abundance is 70425554973455568000
Bases of 40920248045175192000
- Binary: 1000110111111000011110110011001010110101011000101000111001110000002
- Hexadecimal: 0x237E1ECCAD58A39C0
- Base-36: 8MW55B7NDZAO0
Squares and roots of 40920248045175192000
- 40920248045175192000 squared (409202480451751920002) is 1674466700078664122216029972236864000000
- 40920248045175192000 cubed (409202480451751920003) is 68519592710604910063442322863986209095827000677888000000000
-
The
square root of 40920248045175192000 is 6396893624.6568296361 -
40920248045175192000 is a
perfect cube number . Itscube root is 3445980
Scales and comparisons
How big is 40920248045175192000?- 40,920,248,045,175,192,000 seconds is equal to 293,274,701,009 years, 3 weeks, 3 days, 15 hours, 30 minutes, 7 seconds.
-
To count from 1 to 40,920,248,045,175,192,000 would take you about two hundred ninety-three billion, two hundred seventy-four million, seven hundred one thousand and nine years!
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
- A cube with a volume of 40920248045175192000 cubic inches would be around 287165 feet tall.
Recreational maths with 40920248045175192000
- 40920248045175192000 backwards is 00029157154084202904
- The number of decimal digits it has is: 20
- The sum of 40920248045175192000's digits is 63
- More coming soon!
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 40920248045175192000 - Facts about the integer". Numbermatics.com. 2024. Web. 4 May 2024.
APA style:
Numbermatics. (2024). Number 40920248045175192000 - Facts about the integer. Retrieved 4 May 2024, from https://numbermatics.com/n/40920248045175192000/
Chicago style:
Numbermatics. 2024. "Number 40920248045175192000 - Facts about the integer". https://numbermatics.com/n/40920248045175192000/
The information we have on file for 40920248045175192000 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
Keywords: Divisors of 40920248045175192000, math, Factors of 40920248045175192000, curriculum, school, college, exams, university, Prime factorization of 40920248045175192000, STEM, science, technology, engineering, physics, economics, calculator, forty quintillion, nine hundred twenty quadrillion, two hundred forty-eight trillion, forty-five billion, one hundred seventy-five million, one hundred ninety-two thousand.