131028692333760
131,028,692,333,760 is an even composite number composed of eight prime numbers multiplied together.
What does the number 131028692333760 look like?
This visualization shows the relationship between its 8 prime factors (large circles) and 2240 divisors.
131028692333760 is an even composite number. It is composed of eight distinct prime numbers multiplied together. It has a total of two thousand, two hundred forty divisors.
Prime factorization of 131028692333760:
26 × 34 × 5 × 13 × 17 × 127 × 233 × 773
(2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 × 3 × 5 × 13 × 17 × 127 × 233 × 773)See below for interesting mathematical facts about the number 131028692333760 from the Numbermatics database.
Names of 131028692333760
- Cardinal: 131028692333760 can be written as One hundred thirty-one trillion, twenty-eight billion, six hundred ninety-two million, three hundred thirty-three thousand, seven hundred sixty.
Scientific notation
- Scientific notation: 1.3102869233376 × 1014
Factors of 131028692333760
Divisors of 131028692333760
- Number of divisors d(n): 2240
-
Complete list of divisors:
1 2 3 4 5 6 8 9 10 12 13 15 16 17 18 20 24 26 27 30 32 34 36 39 40 45 48 51 52 54 60 64 65 68 72 78 80 81 85 90 96 102 104 108 117 120 127 130 135 136 144 153 156 160 162 170 180 192 195 204 208 216 221 233 234 240 254 255 260 270 272 288 306 312 320 324 340 351 360 381 390 405 408 416 432 442 459 466 468 480 508 510 520 540 544 576 585 612 624 635 648 663 680 699 702 720 762 765 773 780 810 816 832 864 884 918 932 936 960 1016 1020 1040 1053 1080 1088 1105 1143 1165 1170 1224 1248 1270 1296 1326 1360 1377 1398 1404 1440 1524 1530 1546 1560 1620 1632 1651 1728 1755 1768 1836 1864 1872 1905 1989 2032 2040 2080 2097 2106 2159 2160 2210 2286 2295 2319 2330 2340 2448 2496 2540 2592 2652 2720 2754 2796 2808 2880 3029 3048 3060 3092 3120 3240 3264 3302 3315 3429 3495 3510 3536 3672 3728 3744 3810 3865 3961 3978 4064 4080 4160 4194 4212 4318 4320 4420 4572 4590 4638 4660 4680 4896 4953 5080 5184 5265 5304 5440 5508 5592 5616 5715 5967 6058 6096 6120 6184 6240 6291 6477 6480 6604 6630 6858 6885 6957 6990 7020 7072 7344 7456 7488 7620 7730 7922 7956 8128 8160 8255 8388 8424 8636 8640 8840 9087 9144 9180 9276 9320 9360 9792 9906 9945 10049 10160 10287 10485 10530 10608 10795 11016 11184 11232 11430 11595 11883 11934 12116 12192 12240 12368 12480 12582 12954 12960 13141 13208 13260 13716 13770 13914 13980 14040 14144 14688 14859 14912 15145 15240 15460 15844 15912 16320 16510 16776 16848 17145 17272 17680 17901 18174 18288 18360 18552 18640 18720 18873 19431 19805 19812 19890 20098 20320 20574 20871 20970 21060 21216 21590 22032 22368 22464 22860 23190 23766 23868 24232 24384 24480 24736 24765 25164 25908 25920 26282 26416 26520 27261 27432 27540 27828 27960 28067 28080 29376 29591 29718 29835 30147 30290 30480 30920 31455 31688 31824 32385 33020 33552 33696 34290 34544 34785 35360 35649 35802 36348 36576 36720 37104 37280 37440 37746 38862 39423 39610 39624 39780 40196 40640 41148 41742 41940 42120 42432 43180 44064 44577 44736 45435 45720 46380 47532 47736 48464 48960 49472 49530 50245 50328 51435 51493 51816 52564 52832 53040 54522 54864 55080 55656 55920 56134 56160 58293 59182 59415 59436 59670 60294 60580 60960 61840 62613 62910 63376 63648 64770 65705 66040 67104 67392 68580 69088 69570 70720 71298 71604 72696 73152 73440 74208 74295 74560 75492 77724 78846 79220 79248 79560 80392 81783 82296 83484 83880 84201 84240 86360 88128 88773 89154 89505 90441 90870 91440 92760 94365 95064 95472 96928 97155 98171 99060 100490 100656 102870 102986 103632 104355 105128 105664 106080 106947 109044 109728 110160 111312 111840 112268 112320 116586 118269 118364 118830 118872 119340 120588 121160 121920 123680 125226 125820 126752 127296 129540 131410 132080 133731 134208 136305 137160 138176 139140 140335 142596 143208 145392 146880 147955 148416 148590 150735 150984 154479 155448 157692 158440 158496 159120 160784 163566 164592 166968 167760 168402 168480 170833 172720 174879 177546 178245 178308 179010 180109 180882 181740 182880 185520 188730 190128 190944 193856 194310 196342 197115 198120 200980 201312 205740 205972 207264 208710 210256 212160 213894 218088 219456 220320 222624 222885 223680 224536 233172 236538 236728 237660 237744 238680 241176 242320 245349 247360 250452 251640 252603 253504 257465 259080 262820 264160 266319 267462 271323 272610 274320 278280 280670 285192 286416 290784 291465 294513 295910 297180 301470 301968 308958 310896 313065 315384 316880 316992 318240 320841 321568 327132 329184 333936 335520 336804 336960 341666 345440 349758 354807 355092 356490 356616 358020 360218 361764 363480 365760 371040 377460 380256 381888 384683 388620 392684 394230 396240 401960 402624 408915 411480 411944 414528 417420 420512 421005 427788 436176 440640 443865 445248 445770 449072 452205 463437 466344 473076 473456 475320 475488 477360 482352 484640 490698 490855 500904 503047 503280 505206 512499 514930 518160 525640 528320 532638 534735 534924 540327 542646 545220 548640 556560 561340 570384 572832 581568 582930 589026 591345 591820 594360 602940 603936 617916 621792 626130 630768 633760 636480 641682 643136 654264 658368 667872 668655 671040 673608 683332 690880 699516 709614 710184 712980 713232 716040 720436 723528 726960 742080 754920 757809 760512 769366 772395 777240 785368 788460 792480 798957 803920 813969 817830 822960 823888 834840 841024 842010 854165 855576 872352 874395 883539 887730 891540 898144 900545 904410 926874 932688 946152 946912 950640 950976 954720 964704 969280 981396 981710 1001808 1006094 1006560 1010412 1024998 1029860 1036320 1051280 1064421 1065276 1069470 1069848 1080654 1085292 1090440 1097280 1113120 1122680 1140768 1145664 1154049 1165860 1178052 1182690 1183640 1188720 1205880 1207872 1226745 1235832 1243584 1252260 1261536 1263015 1267520 1276223 1283364 1308528 1331595 1335744 1337310 1347216 1356615 1366664 1390311 1399032 1419228 1420368 1425960 1426464 1432080 1440872 1447056 1453920 1472565 1509141 1509840 1515618 1537497 1538732 1544790 1554480 1570736 1576920 1584960 1597914 1604205 1607840 1620981 1627938 1635660 1645920 1647776 1668907 1669680 1684020 1708330 1711152 1744704 1748790 1767078 1774035 1775460 1783080 1796288 1801090 1808820 1853748 1865376 1892304 1893824 1901280 1909440 1923415 1929408 1962792 1963420 2003616 2012188 2013120 2020824 2049996 2059720 2072640 2102560 2128842 2130552 2138940 2139696 2161308 2170584 2180880 2226240 2245360 2273427 2281536 2308098 2317185 2331720 2341417 2356104 2365380 2367280 2377440 2396871 2411760 2453490 2471664 2504520 2515235 2523072 2526030 2552446 2562495 2566728 2617056 2650617 2663190 2674620 2694432 2701635 2713230 2733328 2780622 2798064 2838456 2840736 2851920 2852928 2864160 2881744 2894112 2907840 2945130 3018282 3019680 3031236 3061853 3074994 3077464 3089580 3108960 3141472 3153840 3195828 3208410 3215680 3241962 3255876 3271320 3291840 3295552 3337814 3339360 3368040 3416660 3422304 3462147 3497580 3534156 3548070 3550920 3566160 3602180 3617640 3707496 3730752 3784608 3789045 3802560 3828669 3846830 3925584 3926840 3994785 4007232 4024376 4041648 4069845 4099992 4119440 4170933 4205120 4257684 4261104 4277880 4279392 4322616 4341168 4361760 4417695 4490720 4527423 4546854 4612491 4616196 4634370 4663440 4682834 4712208 4730760 4734560 4754880 4793742 4823520 4862943 4906980 4943328 5006721 5009040 5030470 5052060 5104892 5124990 5133456 5234112 5301234 5322105 5326380 5349240 5388864 5403270 5426460 5466656 5561244 5596128 5676912 5681472 5703840 5728320 5763488 5770245 5788224 5890260 6036564 6039360 6062472 6123706 6149988 6154928 6179160 6217920 6282944 6307680 6381115 6391656 6416820 6483924 6511752 6539611 6542640 6675628 6678720 6736080 6833320 6844608 6924294 6951555 6995160 7024251 7068312 7096140 7101840 7132320 7204360 7235280 7414992 7545705 7569216 7578090 7657338 7687485 7693660 7851168 7853680 7951851 7989570 8048752 8083296 8104905 8139690 8199984 8238880 8341866 8344535 8515368 8522208 8555760 8558784 8645232 8682336 8723520 8835390 8981440 9054846 9093708 9185559 9224982 9232392 9268740 9326880 9365668 9424416 9461520 9469120 9587484 9647040 9725886 9813960 9886656 10013442 10018080 10060940 10104120 10209784 10249980 10266912 10386441 10602468 10644210 10652760 10698480 10806540 10852920 10933312 11122488 11192256 11353824 11367135 11407680 11486007 11526976 11540490 11707085 11780520 11984355 12073128 12124944 12247412 12299976 12309856 12358320 12615360 12762230 12783312 12833640 12967848 13023504 13079222 13085280 13253085 13351256 13472160 13582269 13666640 13837473 13848588 13903110 13990320 14048502 14136624 14192280 14203680 14264640 14408720 14470560 14588829 14829984 15020163 15091410 15156180 15309265 15314676 15374970 15387320 15702336 15707360 15903702 15979140 16097504 16166592 16209810 16279380 16399968 16477760 16683732 16689070 17030736 17044416 17111520 17290464 17310735 17364672 17670780 18109692 18187416 18371118 18449964 18464784 18537480 18653760 18731336 18848832 18923040 19143345 19174968 19451772 19618833 19627920 20026884 20036160 20121880 20208240 20419568 20499960 20533824 20772882 20854665 21072753 21204936 21288420 21305520 21396960 21613080 21695791 21705840 22244976 22637115 22707648 22734270 22873843 22972014 23062455 23080980 23414170 23561040 23968710 24146256 24249888 24314715 24494824 24599952 24619712 24716640 25033605 25524460 25566624 25667280 25935696 26047008 26158444 26170560 26506170 26702512 26944320 27164538 27333280 27556677 27674946 27697176 27806220 27980640 28097004 28273248 28384560 28407360 28817440 28941120 29177658 29659968 30040326 30182820 30312360 30618530 30629352 30749940 30774640 31159323 31414720 31807404 31958280 32195008 32419620 32558760 32698055 32799936 33367464 33378140 34061472 34223040 34458021 34580928 34621470 35121255 35341560 36219384 36374832 36742236 36899928 36929568 37074960 37462672 37846080 38286690 38349936 38903544 39237666 39255840 39759255 39804089 40053768 40243760 40416480 40746807 40839136 40999920 41545764 41709330 42145506 42409872 42576840 42611040 42793920 43226160 43391582 43411680 44489952 45060489 45274230 45468540 45747686 45927795 45944028 46124910 46161960 46828340 47122080 47937420 48292512 48499776 48629430 48989648 49199904 49433280 50067210 51048920 51133248 51334560 51871392 51932205 52094016 52316888 53012340 53405024 54329076 54666560 55113354 55349892 55394352 55612440 55961280 56194008 56546496 56769120 57430035 57634880 58355316 58856499 60080652 60365640 60624720 61237060 61258704 61499880 61549280 62318646 63218259 63614808 63916560 64839240 65087373 65117520 65396110 66734928 66756280 67911345 68122944 68621529 68916042 69187365 69242940 70242510 70683120 72438768 72749664 72944145 73484472 73799856 73859136 74149920 74925344 75100815 76573380 76699872 77807088 78475332 78511680 79518510 79608178 80107536 80487520 80832960 81493614 81678272 81999840 82670031 83091528 83418660 84291012 84819744 85153680 85222080 86452320 86783164 86823360 88979904 90120978 90548460 90937080 91495372 91855590 91888056 92249820 92323920 93656680 94244160 95874840 96585024 97258860 97979296 98094165 98399808 100134420 102097840 102669120 103374063 103742784 103864410 104633776 105363765 106024680 106810048 108478955 108658152 110226708 110699784 110788704 111224880 112388016 113538240 114369215 114860070 116710632 117712998 119412267 120161304 120731280 121249440 122474120 122517408 122999760 123098560 124637292 126436518 127229616 127833120 129678480 130174746 130235040 130792220 133469856 133512560 135181467 135822690 137243058 137783385 137832084 138374730 138485880 140485020 141366240 144877536 145499328 145888290 146968944 147599712 148299840 149850688 150201630 153146760 153399744 155614176 155796615 156950664 159037020 159216356 160215072 160975040 162987228 163999680 165340062 166183056 166837320 168582024 169639488 170307360 172290105 172904640 173566328 176569497 180241956 181096920 181874160 182990744 183711180 183776112 184499640 184647840 187313360 189654777 191749680 194517720 195262119 195958592 196188330 199020445 200268840 203734035 204195680 205864587 206748126 207728820 209267552 210727530 212049360 216957910 217316304 220453416 221399568 221577408 222449760 224776032 225302445 228738430 229720140 233421264 235425996 238824534 240322608 241462560 242498880 244948240 245034816 245999520 248010093 249274584 252873036 254459232 255666240 259356960 260349492 260470080 261584440 266939712 267025120 270362934 271645380 274486116 275566770 275664168 276749460 276971760 280970040 282732480 289755072 291776580 293937888 294282495 295199424 297359959 300403260 306293520 311228352 311593230 313901328 316091295 318074040 318432712 320430144 325436865 325974456 330680124 332366112 333674640 337164048 340614720 343107645 344580210 347132656 353138994 358236801 360483912 362193840 363748320 365981488 367422360 367552224 368999280 369295680 374626720 379309554 383499360 388855331 389035440 390524238 392376660 398040890 400537680 407468070 408391360 411729174 413350155 413496252 415457640 418535104 421455060 424098720 433915820 434632608 440906832 442799136 444899520 449552064 450604890 457476860 459440280 466842528 470851992 477649068 480645216 482925120 489896480 491999040 496020186 498549168 505746072 508918464 516870315 518713920 520698984 523168880 529708491 534050240 540725868 543290760 548972232 551133540 551328336 553498920 553943520 561940080 583553160 585786357 587875776 588564990 594719918 597061335 600806520 612587040 617593761 623186460 627802656 632182590 636148080 636865424 650873730 651948912 661360248 664732224 667349280 674328096 675907335 686215290 689160420 694265312 706277988 716473602 720967824 724387680 727496640 731962976 734844720 735104448 737998560 749253440 758619108 766998720 777710662 778070880 781048476 784753320 796081780 801075360 814936140 823458348 826700310 826992504 830915280 842910120 848197440 867831640 869265216 881813664 882847485 885598272 892079877 901209780 914953720 918880560 933685056 941703984 948273885 955298136 961290432 976310595 979792960 992040372 997098336 1011492144 1029322935 1033740630 1041397968 1046337760 1059416982 1074710403 1081451736 1086581520 1097944464 1102267080 1102656672 1106997840 1107887040 1123880160 1166565993 1167106320 1171572714 1177129980 1189439836 1194122670 1201613040 1225174080 1235187522 1240050465 1246372920 1255605312 1264365180 1272296160 1273730848 1301747460 1303897824 1322720496 1334698560 1348656192 1351814670 1372430580 1378320840 1388530624 1412555976 1432947204 1441935648 1448775360 1463925952 1469689440 1475997120 1486799795 1517238216 1555421324 1556141760 1562096952 1569506640 1592163560 1602150720 1629872280 1646916696 1653400620 1653985008 1661830560 1685820240 1735663280 1757359071 1763627328 1765694970 1784159754 1791184005 1802419560 1829907440 1837761120 1852781283 1883407968 1896547770 1910596272 1944276655 1952621190 1984080744 1994196672 2022984288 2058645870 2067481260 2082795936 2092675520 2118833964 2149420806 2162903472 2173163040 2195888928 2204534160 2205313344 2213995680 2247760320 2333131986 2334212640 2343145428 2354259960 2378879672 2388245340 2403226080 2470375044 2480100930 2492745840 2528730360 2544592320 2547461696 2603494920 2607795648 2645440992 2648542455 2676239631 2703629340 2744861160 2756641680 2825111952 2865894408 2883871296 2928931785 2939378880 2973599590 3034476432 3087968805 3110842648 3124193904 3139013280 3184327120 3224131209 3259744560 3293833392 3306801240 3307970016 3323661120 3371640480 3471326560 3499697979 3514718142 3531389940 3568319508 3582368010 3604839120 3659814880 3675522240 3705562566 3766815936 3793095540 3821192544 3888553310 3905242380 3968161488 4045968576 4117291740 4134962520 4165591872 4237667928 4298841612 4325806944 4346326080 4391777856 4409068320 4427991360 4460399385 4666263972 4668425280 4686290856 4708519920 4757759344 4776490680 4806452160 4940750088 4960201860 4985491680 5055119303 5057460720 5206989840 5290881984 5297084910 5352479262 5373552015 5407258680 5489722320 5513283360 5650223904 5731788816 5832829965 5857863570 5947199180 6068952864 6175937610 6221685296 6248387808 6278026560 6368654240 6448262418 6519489120 6587666784 6613602480 6615940032 6743280960 6942653120 6999395958 7029436284 7062779880 7136639016 7164736020 7209678240 7319629760 7411125132 7586191080 7642385088 7777106620 7810484760 7936322976 8028718893 8234583480 8269925040 8475335856 8597683224 8651613888 8786795355 8818136640 8920798770 9263906415 9332527944 9372581712 9417039840 9515518688 9552981360 9881500176 9920403720 9970983360 10110238606 10114921440 10413979680 10499093937 10594169820 10704958524 10747104030 10814517360 10979444640 11026566720 11300447808 11463577632 11665659930 11715727140 11894398360 12137905728 12351875220 12443370592 12496775616 12737308480 12896524836 13038978240 13175333568 13227204960 13381198155 13998791916 14058872568 14125559760 14273278032 14329472040 14419356480 14822250264 15165357909 15172382160 15554213240 15620969520 15872645952 16057437786 16120656045 16469166960 16539850080 16950671712 17195366448 17498489895 17573590710 17841597540 18527812830 18665055888 18745163424 18834079680 19031037376 19105962720 19763000352 19840807440 20220477212 20229842880 20827959360 20998187874 21188339640 21409917048 21494208060 21629034720 21958889280 22927155264 23331319860 23431454280 23788796720 24086156679 24703750440 24886741184 25275596515 25793049672 26454409920 26762396310 27997583832 28117745136 28251119520 28546556064 28658944080 29644500528 30330715818 30344764320 31108426480 31241939040 31497281811 32114875572 32241312090 32938333920 33079700160 33901343424 34390732896 34996979790 35147181420 35683195080 37055625660 37330111776 37490326848 38211925440 39526000704 39681614880 40143594465 40440954424 41996375748 42376679280 42819834096 42988416120 43258069440 45496073727 46662639720 46862908560 47577593440 48172313358 49407500880 50551193030 51586099344 52495469685 53524792620 55995167664 56235490272 56502239040 57093112128 57317888160 59289001056 60661431636 60689528640 62216852960 62483878080 62994563622 64229751144 64482624180 65876667840 68781465792 69993959580 70294362840 71366390160 74111251320 74660223552 75826789545 79363229760 80287188930 80881908848 83992751496 84753358560 85639668192 85976832240 90992147454 93325279440 93725817120 95155186880 96344626716 98815001760 101102386060 103172198688 104990939370 107049585240 111990335328 112470980544 114635776320 118578002112 120430783395 121322863272 124433705920 125989127244 128459502288 128965248360 136488221181 139987919160 140588725680 142732780320 148222502640 151653579090 157486409055 160574377860 161763817696 167985502992 169506717120 171279336384 171953664480 181984294908 186650558880 187451634240 192689253432 197630003520 202204772120 206344397376 209981878740 214099170480 223980670656 227480368635 240861566790 242645726544 251978254488 256919004576 257930496720 272976442362 279975838320 281177451360 285465560640 296445005280 303307158180 314972818110 321148755720 323527635392 335971005984 343907328960 363968589816 373301117760 385378506864 404409544240 409464663543 419963757480 428198340960 454960737270 481723133580 485291453088 503956508976 513838009152 515860993440 545952884724 559951676640 562354902720 592890010560 606614316360 629945636220 642297511440 671942011968 682441105905 727937179632 770757013728 808819088480 818929327086 839927514960 856396681920 909921474540 963446267160 970582906176 1007913017952 1031721986880 1091905769448 1119903353280 1213228632720 1259891272440 1284595022880 1364882211810 1455874359264 1541514027456 1617638176960 1637858654172 1679855029920 1819842949080 1926892534320 2015826035904 2047323317715 2183811538896 2426457265440 2519782544880 2569190045760 2729764423620 2911748718528 3275717308344 3359710059840 3639685898160 3853785068640 4094646635430 4367623077792 4852914530880 5039565089760 5459528847240 6551434616688 7279371796320 7707570137280 8189293270860 8735246155584 10079130179520 10919057694480 13102869233376 14558743592640 16378586541720 21838115388960 26205738466752 32757173083440 43676230777920 65514346166880 131028692333760
- Sum of all divisors σ(n): 538651247726592
- Sum of proper divisors (its aliquot sum) s(n): 407622555392832
- 131028692333760 is an abundant number, because the sum of its proper divisors (407622555392832) is greater than itself. Its abundance is 276593863059072
Bases of 131028692333760
- Binary: 111011100101011011111101010100101110100110000002
- Hexadecimal: 0x772B7EA974C0
- Base-36: 1AG1R0CS00
Squares and roots of 131028692333760
- 131028692333760 squared (1310286923337602) is 17168518214695136595235737600
- 131028692333760 cubed (1310286923337603) is 2249568490979843566171720919409098981376000
-
The
square root of 131028692333760 is 11446776.5040538815 -
The
cube root of 131028692333760 is 50791.2384312203
Scales and comparisons
How big is 131028692333760?- 131,028,692,333,760 seconds is equal to 4,166,307 years, 6 weeks, 21 hours, 36 minutes.
-
To count from 1 to 131,028,692,333,760 would take you about ten million, four hundred fifteen thousand, seven hundred sixty-seven 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 131028692333760 cubic inches would be around 4232.6 feet tall.
Recreational maths with 131028692333760
- 131028692333760 backwards is 067333296820131
- 131028692333760 is a
Harshad number . - The number of decimal digits it has is: 15
- The sum of 131028692333760's digits is 54
- 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 131028692333760 - Facts about the integer". Numbermatics.com. 2024. Web. 14 June 2024.
APA style:
Numbermatics. (2024). Number 131028692333760 - Facts about the integer. Retrieved 14 June 2024, from https://numbermatics.com/n/131028692333760/
Chicago style:
Numbermatics. 2024. "Number 131028692333760 - Facts about the integer". https://numbermatics.com/n/131028692333760/
The information we have on file for 131028692333760 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 131028692333760, math, Factors of 131028692333760, curriculum, school, college, exams, university, Prime factorization of 131028692333760, STEM, science, technology, engineering, physics, economics, calculator, one hundred thirty-one trillion, twenty-eight billion, six hundred ninety-two million, three hundred thirty-three thousand, seven hundred sixty.