81938672640

Names of 81938672640

• Cardinal: 81938672640 can be written as Eighty-one billion, nine hundred thirty-eight million, six hundred seventy-two thousand, six hundred forty.

Scientific notation

• Scientific notation: 8.193867264 × 10¹⁰

Factors of 81938672640

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 17
• Sum of prime factors: 332

Divisors of 81938672640

• Number of divisors d(n): 1056
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 11 12 15 16 17 18 20 22 24 30 32 33 34 36 37 40 44 45 48 51 55 60 64 66 68 72 74 80 85 88 90 96 99 102 110 111 120 128 132 136 144 148 153 160 165 170 176 180 185 187 192 198 204 220 222 240 255 256 257 264 272 288 296 306 320 330 333 340 352 360 370 374 384 396 407 408 440 444 480 495 510 512 514 528 544 555 561 576 592 612 629 640 660 666 680 704 720 740 748 765 768 771 792 814 816 880 888 935 960 990 1020 1024 1028 1056 1088 1110 1122 1152 1184 1221 1224 1258 1280 1285 1320 1332 1360 1408 1440 1480 1496 1530 1536 1542 1584 1628 1632 1665 1683 1760 1776 1870 1887 1920 1980 2035 2040 2056 2112 2176 2220 2244 2304 2313 2368 2442 2448 2516 2560 2570 2640 2664 2720 2805 2816 2827 2880 2960 2992 3060 3072 3084 3145 3168 3256 3264 3330 3366 3520 3552 3663 3740 3774 3840 3855 3960 4070 4080 4112 4224 4352 4369 4440 4488 4608 4626 4736 4884 4896 5032 5120 5140 5280 5328 5440 5610 5632 5654 5661 5760 5920 5984 6105 6120 6168 6290 6336 6512 6528 6660 6732 6919 7040 7104 7326 7480 7548 7680 7710 7920 8140 8160 8224 8415 8448 8481 8704 8738 8880 8976 9216 9252 9435 9472 9509 9768 9792 10064 10280 10560 10656 10880 11220 11264 11308 11322 11520 11565 11840 11968 12210 12240 12336 12580 12672 13024 13056 13107 13320 13464 13838 14080 14135 14208 14652 14960 15096 15360 15420 15840 16280 16320 16448 16830 16896 16962 17408 17476 17760 17952 18315 18504 18870 18944 19018 19536 19584 20128 20560 20757 21120 21312 21760 21845 22440 22616 22644 23040 23130 23680 23936 24420 24480 24672 25160 25344 25443 26048 26112 26214 26640 26928 27676 28160 28270 28305 28416 28527 29304 29920 30192 30840 31680 32560 32640 32896 33660 33792 33924 34595 34952 35520 35904 36630 37008 37740 37888 38036 39072 39168 39321 40256 41120 41514 42240 42405 42624 43520 43690 44880 45232 45288 46080 46260 47360 47545 47872 48059 48840 48960 49344 50320 50688 50886 52096 52224 52428 53280 53856 55352 56320 56540 56610 56832 57054 58608 59840 60384 61680 62271 63360 65120 65280 65535 65792 67320 67848 69190 69904 71040 71808 73260 74016 75480 76072 78144 78336 78642 80512 82240 83028 84480 84810 85248 85581 87040 87380 89760 90464 90576 92520 94720 95090 95744 96118 97680 97920 98688 100640 101376 101772 103785 104192 104599 104856 106560 107712 110704 113080 113220 113664 114108 117216 119680 120768 123360 124542 126720 127215 130240 130560 131070 131584 134640 135696 138380 139808 142080 142635 143616 144177 146520 148032 150960 152144 156288 156672 157284 161024 161653 164480 166056 168960 169620 170496 171162 174760 179520 180928 181152 185040 189440 190180 191488 192236 195360 195840 196605 197376 201280 203544 207570 208384 209198 209712 213120 215424 221408 226160 226440 228216 234432 239360 240295 241536 246720 249084 253440 254430 260480 261120 262140 263168 269280 271392 276760 279616 284160 285270 287232 288354 293040 296064 301920 304288 311355 312576 313797 314568 322048 323306 328960 332112 339240 340992 342324 349520 359040 361856 362304 370080 380360 384472 390720 391680 393210 394752 402560 407088 415140 416768 418396 419424 426240 427905 430848 432531 442816 452320 452880 456432 468864 478720 480590 483072 484959 493440 498168 506880 508860 520960 522995 524280 538560 542784 553520 559232 568320 570540 574464 576708 586080 592128 603840 608576 622710 625152 627594 629136 644096 646612 657920 664224 678480 684648 699040 718080 720885 723712 724608 740160 760720 768944 781440 783360 786420 789504 805120 808265 814176 830280 836792 838848 852480 855810 861696 865062 885632 904640 905760 912864 937728 941391 957440 961180 966144 969918 986880 996336 1017720 1041920 1045990 1048560 1077120 1085568 1107040 1118464 1141080 1153416 1172160 1184256 1207680 1217152 1245420 1250304 1255188 1258272 1293224 1315840 1328448 1356960 1369296 1398080 1436160 1441770 1447424 1449216 1454877 1480320 1521440 1537888 1562880 1568985 1572840 1610240 1616530 1628352 1660560 1673584 1677696 1704960 1711620 1723392 1730124 1771264 1778183 1809280 1811520 1825728 1875456 1882782 1922360 1932288 1939836 1973760 1992672 2035440 2083840 2091980 2097120 2154240 2162655 2171136 2214080 2236928 2282160 2306832 2344320 2368512 2415360 2424795 2434304 2490840 2510376 2516544 2586448 2656896 2713920 2738592 2796160 2872320 2883540 2894848 2898432 2909754 2960640 3042880 3075776 3125760 3137970 3145680 3220480 3233060 3256704 3321120 3347168 3355392 3423240 3460248 3542528 3556366 3618560 3623040 3651456 3750912 3765564 3844720 3879672 3947520 3985344 4070880 4183960 4194240 4308480 4325310 4342272 4428160 4473856 4564320 4613664 4688640 4706955 4830720 4849590 4868608 4981680 5020752 5033088 5172896 5313792 5334549 5427840 5477184 5592320 5767080 5796864 5819508 5921280 6085760 6151552 6251520 6275940 6291360 6466120 6513408 6642240 6694336 6710784 6846480 6920496 7085056 7112732 7237120 7246080 7274385 7302912 7531128 7689440 7759344 7970688 8141760 8367920 8388480 8616960 8650620 8684544 8856320 8890915 9128640 9227328 9377280 9413910 9661440 9699180 9737216 9963360 10041504 10066176 10345792 10627584 10669098 10855680 10954368 11184640 11534160 11639016 11842560 12171520 12303104 12551880 12582720 12932240 13026816 13284480 13388672 13421568 13692960 13840992 14225464 14474240 14492160 14548770 14605824 15062256 15378880 15518688 15941376 16003647 16283520 16735840 16776960 17301240 17712640 17781830 18257280 18454656 18754560 18827820 19398360 19926720 20083008 20132352 20691584 21255168 21338196 21711360 21908736 22369280 23068320 23278032 24343040 24606208 25103760 25165440 25864480 26053632 26568960 26672745 26777344 27385920 27681984 28450928 28984320 29097540 29211648 30124512 30757760 31037376 31882752 32007294 32567040 33471680 33553920 34602480 35425280 35563660 36514560 36909312 37655640 38796720 39853440 40166016 40264704 41383168 42676392 43422720 43817472 46136640 46556064 48686080 49212416 50207520 50330880 51728960 53137920 53345490 53554688 54771840 55363968 56901856 58195080 60249024 61515520 62074752 63765504 64014588 65134080 66943360 67107840 69204960 71127320 73029120 73818624 75311280 77593440 79706880 80018235 80332032 82766336 85352784 87634944 92273280 93112128 100415040 100661760 103457920 106275840 106690980 107109376 109543680 110727936 113803712 116390160 120498048 123031040 124149504 128029176 130268160 133886720 138409920 142254640 146058240 147637248 150622560 155186880 159413760 160036470 160664064 165532672 170705568 184546560 186224256 200830080 201323520 206915840 213381960 219087360 221455872 227607424 232780320 240996096 246062080 248299008 256058352 267773440 276819840 284509280 301245120 310373760 318827520 320072940 321328128 341411136 369093120 372448512 401660160 413831680 426763920 438174720 442911744 455214848 465560640 481992192 496598016 512116704 535546880 553639680 569018560 602490240 620747520 640145880 682822272 738186240 744897024 803320320 827663360 853527840 910429696 931121280 963984384 1024233408 1107279360 1138037120 1204980480 1241495040 1280291760 1365644544 1489794048 1606640640 1707055680 1820859392 1862242560 2048466816 2214558720 2276074240 2409960960 2482990080 2560583520 2731289088 3414111360 3724485120 4096933632 4552148480 4819921920 5121167040 5462578176 6828222720 7448970240 8193867264 9104296960 10242334080 13656445440 16387734528 20484668160 27312890880 40969336320 81938672640
• Sum of all divisors σ(n): 338118940224
• Sum of proper divisors (its aliquot sum) s(n): 256180267584
• 81938672640 is an abundant number, because the sum of its proper divisors (256180267584) is greater than itself. Its abundance is 174241594944

Bases of 81938672640

• Binary: 1001100010011111011001110110000000000₂
• Hexadecimal: 0x1313ECEC00
• Base-36: 11N464G0

Squares and roots of 81938672640

• 81938672640 squared (81938672640²) is 6713946074005084569600
• 81938672640 cubed (81938672640³) is 550131829480515838243969695744000
• The square root of 81938672640 is 286249.3190210241
• The cube root of 81938672640 is 4343.3981441849

Scales and comparisons

• 81,938,672,640 seconds is equal to 2,605 years, 20 weeks, 4 days, 6 hours, 24 minutes.
• To count from 1 to 81,938,672,640 would take you about five thousand, two hundred ten 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 81938672640 cubic inches would be around 361.9 feet tall.

Recreational maths with 81938672640

• 81938672640 backwards is 04627683918
• The number of decimal digits it has is: 11
• The sum of 81938672640's digits is 54
• More coming soon!