3889617248093850
3,889,617,248,093,850 is an even composite number composed of six prime numbers multiplied together.
3889617248093850 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of two thousand, one hundred divisors.
Prime factorization of 3889617248093850:
2 × 36 × 52 × 74 × 13 × 434
(2 × 3 × 3 × 3 × 3 × 3 × 3 × 5 × 5 × 7 × 7 × 7 × 7 × 13 × 43 × 43 × 43 × 43)See below for interesting mathematical facts about the number 3889617248093850 from the Numbermatics database.
Names of 3889617248093850
- Cardinal: 3889617248093850 can be written as Three quadrillion, eight hundred eighty-nine trillion, six hundred seventeen billion, two hundred forty-eight million, ninety-three thousand, eight hundred fifty.
Scientific notation
- Scientific notation: 3.88961724809385 × 1015
Factors of 3889617248093850
Divisors of 3889617248093850
- Number of divisors d(n): 2100
-
Complete list of divisors:
1 2 3 5 6 7 9 10 13 14 15 18 21 25 26 27 30 35 39 42 43 45 49 50 54 63 65 70 75 78 81 86 90 91 98 105 117 126 129 130 135 147 150 162 175 182 189 195 210 215 225 234 243 245 258 270 273 294 301 315 325 343 350 351 378 387 390 405 430 441 450 455 486 490 525 546 559 567 585 602 630 637 645 650 675 686 702 729 735 774 810 819 882 903 910 945 975 1029 1050 1053 1075 1118 1134 1161 1170 1215 1225 1274 1290 1323 1350 1365 1458 1470 1505 1575 1638 1677 1701 1715 1755 1806 1849 1890 1911 1935 1950 2025 2058 2106 2107 2150 2205 2275 2322 2401 2430 2450 2457 2646 2709 2730 2795 2835 2925 3010 3087 3150 3159 3185 3225 3354 3402 3430 3483 3510 3645 3675 3698 3822 3870 3913 3969 4050 4095 4214 4410 4459 4515 4550 4725 4802 4914 5031 5103 5145 5265 5418 5547 5590 5670 5733 5805 5850 6075 6174 6318 6321 6370 6450 6615 6825 6966 7203 7290 7350 7371 7525 7826 7938 8127 8190 8385 8505 8575 8775 8918 9030 9245 9261 9450 9477 9555 9675 10062 10206 10290 10449 10530 10535 11025 11094 11466 11610 11739 11907 12005 12150 12285 12642 12943 13230 13377 13545 13650 13975 14175 14406 14742 14749 15050 15093 15435 15795 15925 16254 16641 16770 17010 17150 17199 17415 17550 18225 18490 18522 18954 18963 19110 19350 19565 19845 20475 20898 21070 21609 22050 22113 22295 22575 23478 23814 24010 24037 24381 24570 25155 25515 25725 25886 26325 26754 27090 27391 27735 27783 27950 28350 28665 29025 29498 30186 30870 31213 31347 31590 31605 31850 33075 33282 34398 34830 35217 35721 36015 36450 36855 37926 38829 39130 39690 40131 40635 40950 41925 42525 43218 44226 44247 44590 45150 45279 46225 46305 47385 47775 48074 48762 49923 50310 51030 51450 51597 52245 52650 52675 54782 55470 55566 56889 57330 58050 58695 59535 60025 61425 62426 62694 63210 64715 64827 66150 66339 66885 67725 70434 71442 72030 72111 73143 73710 73745 75465 77175 77658 78975 79507 80262 81270 82173 83205 83349 83850 85050 85995 87075 88494 90558 90601 92450 92610 93639 94770 94815 95550 97825 99225 99846 103194 103243 104490 105350 105651 108045 110565 111475 113778 116487 117390 119070 120050 120185 120393 121905 122850 125775 127575 129430 129654 132678 132741 133770 135450 135837 136955 138675 138915 143325 144222 146286 147490 149769 150930 154350 154791 156065 156735 157950 158025 159014 164346 166410 166698 168259 170667 171990 174150 176085 178605 180075 181202 184275 187278 189630 191737 194145 194481 195650 198450 200655 203175 206486 211302 216090 216333 219429 221130 221235 222950 226395 231525 232974 236925 238521 240370 240786 243810 246519 249615 250047 251550 255150 257985 261225 265482 271674 271803 273910 277350 277830 280917 284445 286650 293475 297675 299538 309582 309729 312130 313470 316050 316953 323575 324135 331695 334425 336518 341334 349461 352170 357210 360150 360555 361179 365715 368550 368725 377325 383474 388290 388962 397535 398223 401310 406350 407511 410865 416025 416745 429975 432666 438858 442470 449307 452790 453005 463050 464373 468195 473850 474075 477042 493038 499230 500094 504777 512001 515970 516215 522450 528255 540225 543606 552825 556549 561834 568890 575211 582435 583443 586950 595350 600925 601965 609525 619458 633906 634207 647150 648270 648999 663390 663705 668850 679185 684775 694575 698922 715563 721110 722358 731430 737450 739557 748845 754650 773955 780325 783675 795070 796446 815022 815409 821730 832050 833490 841295 842751 853335 859950 880425 893025 898614 906010 928746 929187 936390 948150 950859 958685 970725 972405 1003275 1009554 1024002 1032430 1033591 1048383 1056510 1080450 1081665 1083537 1097145 1105650 1106175 1113098 1131975 1150422 1164870 1166886 1177813 1192605 1194669 1201850 1203930 1219050 1232595 1248075 1250235 1268414 1289925 1297998 1327410 1342159 1347921 1358370 1359015 1369550 1389150 1404585 1422225 1431126 1479114 1497690 1514331 1536003 1547910 1548645 1560650 1567350 1584765 1620675 1630818 1658475 1669647 1682590 1685502 1706670 1725633 1747305 1750329 1760850 1786050 1802775 1805895 1828575 1858374 1901718 1902621 1917370 1941450 1944810 1946997 1987675 1991115 2006550 2037555 2054325 2067182 2083725 2096766 2146689 2163330 2167074 2194290 2212350 2218671 2246535 2263950 2265025 2321865 2340975 2355626 2385210 2389338 2446227 2465190 2496150 2500470 2523885 2528253 2560005 2579850 2581075 2641275 2684318 2695842 2718030 2782745 2787561 2809170 2844450 2852577 2876055 2912175 2917215 3009825 3028662 3072006 3097290 3100773 3145149 3169530 3171035 3241350 3244995 3250611 3316950 3318525 3339294 3395925 3418801 3451266 3494610 3500658 3533439 3577815 3584007 3605550 3611790 3657150 3697785 3744225 3805242 3869775 3893994 3895843 3975350 3982230 4026477 4075110 4077045 4108650 4167450 4206475 4213755 4266675 4293378 4437342 4439449 4493070 4530050 4542993 4643730 4645935 4681950 4754295 4793425 4862025 4892454 5008941 5047770 5056506 5120010 5162150 5167955 5176899 5241915 5282550 5408325 5417685 5485725 5565490 5575122 5705154 5707863 5752110 5824350 5834430 5840991 5889065 5963025 5973345 6019650 6162975 6201546 6251175 6290298 6342070 6440067 6489990 6501222 6637050 6656013 6710795 6739605 6791850 6795075 6837602 7022925 7066878 7155630 7168014 7235137 7338681 7395570 7488450 7571655 7584759 7680015 7739550 7743225 7791686 7923825 8052954 8154090 8244691 8348235 8362683 8412950 8427510 8533350 8628165 8736525 8751645 8878898 9029475 9085986 9291870 9302319 9435447 9508590 9513105 9586850 9724050 9734985 9955575 10017882 10187775 10256403 10335910 10353798 10483830 10600317 10733445 10752021 10816650 10835370 10971450 11093355 11232675 11415726 11609325 11681982 11687529 11778130 11926050 11946690 12079431 12231135 12325950 12502350 12619425 12641265 12800025 12880134 13312026 13318347 13421590 13479210 13590150 13628979 13913725 13937805 14045850 14262885 14380275 14470274 14586075 14677362 15026823 15143310 15169518 15360030 15486450 15503865 15530697 15725745 15847650 15855175 16224975 16253055 16489382 16696470 16725366 17094005 17123589 17256330 17473050 17503290 17522973 17667195 17889075 17920035 18058950 18488925 18604638 18870894 19026210 19320201 19469970 19479215 19911150 19968039 20132385 20375550 20385225 20512806 21068775 21200634 21466890 21504042 21705411 22016043 22186710 22197245 22465350 22714965 22754277 23218650 23229675 23375058 23771475 23931607 24158862 24462270 24734073 25044705 25088049 25238850 25282530 25600050 25839775 25884495 26209575 26636694 27088425 27257958 27270901 27827450 27875610 27906957 28525770 28539315 28760550 29172150 29204955 29445325 29866725 30053646 30769209 31007730 31061394 31451490 31710350 31800951 32200335 32449950 32506110 33280065 33553975 33698025 34188010 34247178 35045946 35062587 35334390 35778150 35840070 36175685 36238293 36693405 36977850 37858275 37923795 38400075 38640402 38958430 39936078 39955041 40264770 40770450 40886937 41223455 41741175 41813415 42137550 43140825 43410822 43758225 44032086 44394490 44444413 45080469 45429930 45508554 46459350 46511595 46592091 47177235 47542950 47565525 47863214 48674925 49468146 50089410 50176098 50645959 51282015 51370767 51679550 51768990 52419150 53001585 53667225 53760105 54176850 54541802 55466775 55813914 57078630 57712837 57960603 58409910 58437645 58890650 59733450 60397155 61155675 61538418 63206325 63601902 64400670 65116233 66048129 66560130 66591735 67107950 67396050 68144895 69689025 70125174 71314425 71794821 72351370 72476586 73386810 74202219 75134115 75264147 75716550 75847590 76800150 77519325 77653485 78628725 79910082 81265275 81773874 81812703 82446910 83482350 83626830 83720871 85470025 85617945 86281650 87516450 87614865 88335975 88888826 89600175 90160938 92307627 93023190 93184182 94354470 95131050 95402853 96601005 97349850 97396075 99840195 100661925 101291918 102564030 102741534 105187761 106003170 107334450 107520210 108527055 108714879 110080215 110933550 110986225 113574825 113771385 115425674 115921206 116875290 119658035 119865123 120794310 122311350 122660811 123670365 125223525 125440245 126412650 129422475 130232466 132096258 133183470 133333239 135241407 136289790 136354505 139378050 139534785 139776273 142628850 142696575 143589642 146024775 148404438 150268230 150528294 151937877 153846045 154112301 155038650 155306970 157257450 159004755 161001675 162530550 163625406 166400325 167441742 167521249 170940050 171235890 173138511 175229730 175312935 176671950 179200350 180878425 181191465 183467025 184615254 189618975 190805706 190896307 193202010 194792150 195348699 199680390 199775205 201323850 204434685 206117275 209067075 210375522 215384463 217054110 217429758 220160430 221972450 222222065 222606657 225402345 227149650 227542770 232557975 232960455 235886175 239316070 239730246 245321622 245438109 247340730 250447050 250880490 251162613 253229795 256410075 256853835 258844950 265007925 266666478 268800525 270482814 272709010 276922881 279069570 279552546 285393150 286208559 288564185 289803015 292049550 292188225 301985775 303875754 307692090 308224602 311110891 315563283 318009510 322003350 325581165 326144637 330240645 332800650 332958675 335042498 340724475 346277022 350625870 354521713 358974105 359595369 361756850 362382930 366934050 371011095 375670575 376320735 379237950 381792614 388267425 390697398 399550410 399999717 405724221 408869370 409063515 412234550 418134150 418604355 428089725 430768926 438074325 444444130 445213314 450804690 455813631 461538135 462336903 465115950 465920910 471772350 477014265 483005025 490876218 499200975 502325226 502563747 506459590 512820150 513707670 519415533 525938805 530015850 537601050 542635275 543574395 550401075 553845762 568856925 572417118 572688921 577128370 579606030 584376450 586046097 598290175 599325615 603971550 613304055 618351825 622221782 627201225 631126566 646153389 651162330 652289274 660481290 665917350 666666195 667819971 676207035 681448950 681772525 697673925 698881365 709043426 717948210 719190738 736314327 742022190 751341150 752641470 753487839 759689385 769230225 770561505 776534850 795023775 799999434 811448442 818127030 830768643 837208710 837606245 856179450 858625677 865692555 876148650 876564675 905957325 911627262 923076270 924673806 933332673 946689849 954028530 954481535 966010050 976743495 978433911 998401950 998876025 1005127494 1022173425 1038831066 1051877610 1063565139 1076922315 1078786107 1085270550 1087148790 1100802150 1111110325 1113033285 1127011725 1137713850 1145377842 1164802275 1172092194 1172648743 1196580350 1198651230 1199999151 1226608110 1227190545 1236703650 1254402450 1255813065 1266148975 1284269175 1292306778 1333332390 1335639942 1352414070 1363545050 1367440893 1384614405 1395347850 1397762730 1431042795 1442820925 1449015075 1472628654 1506975678 1507691241 1519378770 1538460450 1541123010 1555554455 1558246599 1577816415 1590047550 1627905825 1630723185 1651203225 1661537286 1675212490 1717251354 1718066763 1731385110 1753129350 1758138291 1772608565 1794870525 1797976845 1811914650 1855055475 1866665346 1881603675 1893379698 1908963070 1938460167 1953486990 1956867822 1997752050 1999998585 2003459913 2028621105 2044346850 2045317575 2093021775 2127130278 2153844630 2157572214 2177776237 2208942981 2222220650 2226066570 2254023450 2279068155 2307690675 2311684515 2329604550 2345297486 2385071325 2399998302 2454381090 2481651991 2492305929 2511626130 2512818735 2532297950 2568538350 2597077665 2629694025 2717871975 2734881786 2769228810 2799998019 2840069547 2862085590 2863444605 2885641850 2898030150 2930230485 2996628075 3015382482 3066520275 3111108910 3116493198 3155632830 3190695417 3230766945 3236358321 3255811650 3261446370 3302406450 3333330975 3339099855 3381035175 3436133526 3494406825 3516276582 3517946229 3545217130 3589741050 3595953690 3599997453 3681571635 3710110950 3763207350 3767439195 3798446925 3852807525 3876920334 3999997170 4006919826 4057242210 4090635150 4102322679 4153843215 4186043550 4188031225 4293128385 4328462775 4355552474 4417885962 4523073723 4558136310 4615381350 4623369030 4666663365 4674739797 4733449245 4770142650 4772407675 4883717475 4892169555 4963303982 4984611858 5025637470 5154200289 5194155330 5259388050 5274414873 5317825695 5384611575 5393930535 5435743950 5565166425 5599996038 5680139094 5726889210 5815380501 5860460970 5863243715 5993256150 5999995755 6010379739 6133040550 6135952725 6279065325 6381390834 6461533890 6472716642 6533328711 6626828943 6666661950 6678199710 6762070350 6837204465 6923072025 6988813650 7035892458 7155213975 7199994906 7363143270 7444955973 7534878390 7538456205 7596893850 7705615050 7777772275 7791232995 7889082075 8153615925 8204645358 8208541201 8307686430 8376062450 8399994057 8586256770 8590333815 8656925550 8790691455 8863042825 8989884225 9046147446 9333326730 9349479594 9466898490 9544815350 9572086251 9692300835 9767434950 9784339110 9999992925 10017299565 10143105525 10308400578 10548829746 10553838687 10635651390 10769223150 10787861070 10799992359 10888881185 11044714905 11130332850 11395340775 11558422575 11630761002 11726487430 11999991510 12020759478 12271905450 12306968037 12408259955 12461529645 12558130650 12564093675 12985388325 13066657422 13253657886 13569221169 13674408930 13846144050 13999990095 14024219391 14200347735 14310427950 14317223025 14651152425 14889911946 15076912410 15244433659 15462600867 15555544550 15582465990 15778164150 15953477085 16153834725 16181791605 16307231850 16417082402 16695499275 16799988114 17180667630 17446141503 17581382910 17589731145 17726085650 17979768450 17999987265 18407858175 18837195975 19144172502 19384601670 19599986133 19880486829 19999985850 20034599130 20286211050 20511613395 20769216075 21107677374 21465641925 21599984718 21777762370 22089429810 22334867919 22615368615 22790681550 23116845150 23333316825 23373698985 23667246225 24460847775 24613936074 24625623603 24816519910 24923059290 25128187350 25199982171 25771001445 25970776650 26372074365 26589128475 26969652675 27138442338 27999980190 28048438782 28400695470 28634446050 28716258753 29076902505 29302304850 29316218575 29999978775 30051898695 30488867318 30925201734 31661516061 31906954170 32307669450 32363583210 32399977077 32666643555 33134144715 33390998550 34186022325 34892283006 35179462290 35999974530 36815716350 36920904111 37224779865 37674391950 37692281025 38956164975 39199972266 39760973658 40707663507 41023226790 41042706005 41538432150 41999970285 42072658173 42931283850 42951669075 43953457275 44669735838 45230737230 45733300977 46387802601 46666633650 46747397970 47334492450 47860431255 48461504175 48921695550 49251247206 50086497825 50399964342 51542002890 52744148730 52769193435 53178256950 53939305350 53999961795 54444405925 55223574525 57432517506 58153805010 58632437150 58799958399 59999957550 60103797390 61534840185 62041299775 62307648225 63323032122 64799954154 65333287110 66268289430 67004603757 67846105845 68372044650 69999950475 70121096955 71001738675 73841808222 73876870809 74449559730 75384562050 75599946513 76222168295 77313004335 77912329950 79767385425 80908958025 81415327014 82085412010 83999940570 84145316346 85903338150 86148776259 87230707515 87906914550 87948655725 89999936325 91466601954 92775605202 94984548183 95720862510 96923008350 97999930665 99402434145 100172995650 102558066975 105538386870 106711035613 107999923590 108888811850 110447149050 111674339595 113076843075 116868494925 117599916798 122122990521 123069680370 123128118015 124082599550 124615296450 125999910855 128855007225 131860371825 134009207514 135692211690 137199902931 139163407803 139999900950 140242193910 142003477350 143581293765 145384512525 147753741618 150259493475 151199893026 152444336590 154626008670 158307580305 159534770850 161817916050 161999885385 163333217775 165670723575 172297552518 174461415030 175897311450 176399875197 179999872650 184604520555 186123899325 189969096366 195999861330 198804868290 201013811271 203538317535 205116133950 205213530025 209999851425 210363290865 213422071226 221630612427 223348679190 226153686150 226799839539 228666504885 231939013005 233736989850 239302156275 244245981042 246256236030 251999821710 257710014450 258446328777 263720743650 263845967175 269999808975 274399805862 278326815606 284953644549 287162587530 290769025050 293999791995 300518986950 307674200925 316615160610 320133106839 323999770770 326666435550 331341447150 335023018785 339230529225 350605484775 352799750394 369209041110 369384354045 372247798650 377999732565 381110841475 386565021675 402027622542 407076635070 410427060050 411599708793 419999702850 420726581730 430743881295 436153537575 443261224854 453599679078 457333009770 463878026010 474922740915 478604312550 489999653325 497012170725 516892657554 527691934350 529199625591 533555178065 539999617950 558371697975 569907289098 587999583990 603041433813 610614952605 615348401850 615640590075 629999554275 640266213678 664891837281 670046037570 678461058450 685999514655 695817039015 701210969550 717906468825 738768708090 755999465130 762221682950 773130043350 791537901525 809999426925 823199417586 854860933647 861487762590 872307075150 881999375985 923022602775 949845481830 960399320517 979999306650 994024341450 1005069056355 1017691587675 1051816454325 1058399251182 1067110356130 1108153062135 1116743395950 1133999197695 1143332524425 1159695065025 1206082867626 1221229905210 1231281180150 1234799126379 1259999108550 1292231643885 1329783674562 1371999029310 1391634078030 1424768222745 1435812937650 1469998959975 1583075803050 1587598876773 1600665534195 1619998853850 1675115093925 1709721867294 1763998751970 1809124301439 1846045205550 1846921770225 1889998662825 1920798641034 1994675511843 2010138112710 2035383175350 2057998543965 2103632908650 2153719406475 2216306124270 2267998395390 2286665048850 2319390130050 2374613704575 2469598252758 2584463287770 2645998127955 2667775890325 2849536445490 2881197961551 2939997919950 3015207169065 3053074763025 3175197753546 3201331068390 3324459186405 3350230187850 3429997573275 3479085195075 3618248602878 3693843540450 3704397379137 3779997325650 3989351023686 4115997087930 4274304668235 4307438812950 4409996879925 4749227409150 4801996602585 5025345281775 5291996255910 5335551780650 5540765310675 5669995988475 5762395923102 5984026535529 6030414338130 6106149526050 6173995631895 6461158219425 6648918372810 6859995146550 6958170390150 7123841113725 7408794758274 7937994383865 8003327670975 8548609336470 8643593884653 8819993759850 9045621507195 9603993205170 9973377559215 10050690563550 10289992719825 11081530621350 11113192137411 11339991976950 11968053071058 12347991263790 12922316438850 13229990639775 14247682227450 14405989807755 15076035845325 15875988767730 16006655341950 16622295932025 17287187769306 18091243014390 18521986895685 19946755118430 20579985439650 21371523341175 22226384274822 24009983012925 25930781653959 26459981279550 28811979615510 29920132677645 30152071690650 30869978159475 33244591864050 37043973791370 39689971919325 42743046682350 43217969423265 45228107535975 48019966025850 49866887796075 51861563307918 55565960687055 59840265355290 61739956318950 72029949038775 77792344961877 79379943838650 86435938846530 90456215071950 92609934478425 99733775592150 111131921374110 129653908269795 144059898077550 149600663388225 155584689923754 185219868956850 216089847116325 259307816539590 277829803435275 299201326776450 388961724809385 432179694232650 555659606870550 648269541348975 777923449618770 1296539082697950 1944808624046925 3889617248093850
- Sum of all divisors σ(n): 13952024799841086
- Sum of proper divisors (its aliquot sum) s(n): 10062407551747236
- 3889617248093850 is an abundant number, because the sum of its proper divisors (10062407551747236) is greater than itself. Its abundance is 6172790303653386
Bases of 3889617248093850
- Binary: 11011101000110010110000101100110001010000110100110102
- Hexadecimal: 0xDD1961662869A
- Base-36: 12AR5HUKNMI
Squares and roots of 3889617248093850
- 3889617248093850 squared (38896172480938502) is 15129122336669174661458407822500
- 3889617248093850 cubed (38896172480938503) is 58846495189230352764429585942991994054141625000
-
The
square root of 3889617248093850 is 62366796.0383876863 -
The
cube root of 3889617248093850 is 157266.2830429393
Scales and comparisons
How big is 3889617248093850?- 3,889,617,248,093,850 seconds is equal to 123,677,797 years, 5 weeks, 6 days, 5 hours, 37 minutes, 30 seconds.
-
To count from 1 to 3,889,617,248,093,850 would take you about three hundred seventy-one million, thirty-three thousand, three hundred ninety-one 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 3889617248093850 cubic inches would be around 13105.5 feet tall.
Recreational maths with 3889617248093850
- 3889617248093850 backwards is 0583908427169883
- 3889617248093850 is a
Harshad number . - The number of decimal digits it has is: 16
- The sum of 3889617248093850's digits is 81
- 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 3889617248093850 - Facts about the integer". Numbermatics.com. 2024. Web. 13 June 2024.
APA style:
Numbermatics. (2024). Number 3889617248093850 - Facts about the integer. Retrieved 13 June 2024, from https://numbermatics.com/n/3889617248093850/
Chicago style:
Numbermatics. 2024. "Number 3889617248093850 - Facts about the integer". https://numbermatics.com/n/3889617248093850/
The information we have on file for 3889617248093850 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 3889617248093850, math, Factors of 3889617248093850, curriculum, school, college, exams, university, Prime factorization of 3889617248093850, STEM, science, technology, engineering, physics, economics, calculator, three quadrillion, eight hundred eighty-nine trillion, six hundred seventeen billion, two hundred forty-eight million, ninety-three thousand, eight hundred fifty.