81116721840

Names of 81116721840

• Cardinal: 81116721840 can be written as Eighty-one billion, one hundred sixteen million, seven hundred twenty-one thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.111672184 × 10¹⁰

Factors of 81116721840

• Number of distinct prime factors ω(n): 8
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 603

Divisors of 81116721840

• Number of divisors d(n): 640
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 11 12 14 15 16 20 21 22 24 28 30 33 35 40 42 44 48 55 56 60 66 70 71 77 80 84 88 105 110 112 120 132 140 142 154 165 168 176 210 211 213 220 231 240 264 280 284 293 308 330 336 355 385 420 422 426 440 462 497 528 560 568 586 616 633 660 710 770 781 840 844 852 879 880 924 994 1055 1065 1136 1155 1172 1232 1266 1320 1420 1465 1477 1491 1540 1562 1680 1688 1704 1758 1848 1988 2051 2110 2130 2310 2321 2343 2344 2485 2532 2640 2840 2930 2954 2982 3080 3124 3165 3223 3376 3408 3516 3696 3905 3976 4102 4220 4260 4395 4431 4620 4642 4686 4688 4970 5064 5467 5680 5860 5908 5964 6153 6160 6248 6330 6446 6963 7032 7385 7455 7810 7952 8204 8440 8520 8790 8862 9240 9284 9372 9669 9940 10128 10255 10934 11605 11715 11720 11816 11928 12306 12496 12660 12892 13926 14064 14770 14910 14981 15620 16115 16247 16401 16408 16880 17040 17580 17724 18480 18568 18744 19338 19880 20510 20803 21868 22155 22561 23210 23430 23440 23632 23856 24612 25320 25784 27335 27852 29540 29820 29962 30765 31240 32230 32494 32802 32816 34815 35160 35448 37136 37488 38676 39760 41020 41606 43736 44310 44943 45122 46420 46860 48345 48741 49224 50640 51568 54670 55704 59080 59640 59924 61530 61823 62409 62480 64460 64988 65604 67683 69630 70320 70896 74905 77352 81235 82005 82040 83212 87472 88620 89886 90244 92840 93720 96690 97482 98448 104015 104867 109340 111408 112805 118160 119280 119848 123060 123646 124818 128920 129976 131208 135366 139260 145621 149810 154704 162470 164010 164080 164791 166424 177240 179772 180488 185469 185680 187440 193380 194964 208030 209734 218680 224715 225610 228833 239696 243705 246120 247292 249636 257840 259952 262416 270732 278520 291242 299620 309115 312045 314601 324940 328020 329582 332848 338415 354480 359544 360976 370938 386760 389928 416060 419468 432761 436863 437360 449430 451220 457666 487410 492240 494373 494584 499272 524335 541464 557040 582484 599240 618230 624090 629202 649880 656040 659164 676830 680053 686499 719088 728105 741876 773520 779856 823955 832120 838936 865522 873726 898860 902440 915332 927345 974820 988746 989168 998544 1048670 1082928 1144165 1153537 1164968 1198480 1236460 1248180 1258404 1298283 1299760 1312080 1318328 1353660 1360106 1372998 1456210 1483752 1573005 1601831 1647910 1664240 1677872 1731044 1747452 1797720 1804880 1830664 1854690 1949640 1977492 2040159 2097340 2163805 2184315 2288330 2307074 2329936 2471865 2472920 2496360 2516808 2596566 2636656 2707320 2720212 2745996 2912420 2967504 3146010 3203662 3295820 3400265 3432495 3460611 3462088 3494904 3595440 3661328 3709380 3899280 3954984 4080318 4194680 4327610 4368630 4389433 4576660 4614148 4760371 4805493 4943730 4945840 4992720 5033616 5193132 5414640 5440424 5491992 5767685 5824840 6292020 6407324 6491415 6591640 6800530 6864990 6921222 6924176 6989808 7418760 7909968 8009155 8160636 8389360 8655220 8737260 8778866 9153320 9228296 9520742 9610986 9887460 10200795 10386264 10880848 10983984 11535370 11649680 12584040 12814648 12982830 13168299 13183280 13601060 13729980 13842444 14281113 14837520 16018310 16321272 17303055 17310440 17474520 17557732 18306640 18456592 19041484 19221972 19774920 20401590 20772528 21947165 23070740 23801855 24027465 25168080 25629296 25965660 26336598 27202120 27459960 27684888 28562226 30726031 32036620 32642544 34606110 34620880 34949040 35115464 38082968 38443944 39549840 40803180 43894330 46141480 47603710 48054930 48283763 51931320 52673196 54404240 54919920 55369776 57124452 61452062 64073240 65841495 69212220 70230928 71405565 76165936 76887888 81606360 87788660 92178093 92282960 95207420 96109860 96567526 103862640 105346392 114248904 122904124 128146480 131682990 138424440 142811130 144851289 153630155 163212720 175577320 184356186 190414840 192219720 193135052 210692784 228497808 241418815 245808248 263365980 276848880 285622260 289702578 307260310 337986341 351154640 368712372 380829680 384439440 386270104 460890465 482837630 491616496 526731960 571244520 579405156 614520620 675972682 724256445 737424744 772540208 921780930 965675260 1013959023 1053463920 1142489040 1158810312 1229041240 1351945364 1448512890 1474849488 1689931705 1843561860 1931350520 2027918046 2317620624 2458082480 2703890728 2897025780 3379863410 3687123720 3862701040 4055836092 5069795115 5407781456 5794051560 6759726820 7374247440 8111672184 10139590230 11588103120 13519453640 16223344368 20279180460 27038907280 40558360920 81116721840
• Sum of all divisors σ(n): 320523485184
• Sum of proper divisors (its aliquot sum) s(n): 239406763344
• 81116721840 is an abundant number, because the sum of its proper divisors (239406763344) is greater than itself. Its abundance is 158290041504

Bases of 81116721840

• Binary: 1001011100010111011101111001010110000₂
• Hexadecimal: 0x12E2EEF2B0
• Base-36: 119ISV5C

Squares and roots of 81116721840

• 81116721840 squared (81116721840²) is 6579922562067932985600
• 81116721840 cubed (81116721840³) is 533741748196004655176675925504000
• The square root of 81116721840 is 284809.9749657655
• The cube root of 81116721840 is 4328.8260100257

Scales and comparisons

• 81,116,721,840 seconds is equal to 2,579 years, 13 weeks, 3 days, 22 hours, 44 minutes.
• To count from 1 to 81,116,721,840 would take you about five thousand, one hundred fifty-eight 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 81116721840 cubic inches would be around 360.7 feet tall.

Recreational maths with 81116721840

• 81116721840 backwards is 04812761118
• The number of decimal digits it has is: 11
• The sum of 81116721840's digits is 39
• More coming soon!