81431933440

Names of 81431933440

• Cardinal: 81431933440 can be written as Eighty-one billion, four hundred thirty-one million, nine hundred thirty-three thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.143193344 × 10¹⁰

Factors of 81431933440

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 343

Divisors of 81431933440

• Number of divisors d(n): 480
• Complete list of divisors:
  1 2 4 5 8 10 11 13 16 20 22 26 32 40 44 52 55 64 65 71 80 88 104 110 128 130 142 143 160 169 176 208 220 241 256 260 284 286 320 338 352 355 416 440 482 512 520 568 572 640 676 704 710 715 781 832 845 880 923 964 1040 1136 1144 1205 1280 1352 1408 1420 1430 1562 1664 1690 1760 1846 1859 1928 2080 2272 2288 2410 2560 2651 2704 2816 2840 2860 3124 3133 3328 3380 3520 3692 3718 3856 3905 4160 4544 4576 4615 4820 5302 5408 5632 5680 5720 6248 6266 6656 6760 7040 7384 7436 7712 7810 8320 9088 9152 9230 9295 9640 10153 10604 10816 11360 11440 11999 12496 12532 13255 13520 14080 14768 14872 15424 15620 15665 16640 17111 18176 18304 18460 18590 19280 20306 21208 21632 22720 22880 23998 24992 25064 26510 27040 28160 29536 29744 30848 31240 31330 33280 34222 34463 36352 36608 36920 37180 38560 40612 40729 42416 43264 45440 45760 47996 49984 50128 50765 53020 54080 59072 59488 59995 61696 62480 62660 68444 68926 73216 73840 74360 77120 81224 81458 84832 85555 86528 90880 91520 95992 99968 100256 101530 106040 108160 118144 118976 119990 123392 124960 125320 131989 136888 137852 147680 148720 154240 162448 162916 169664 171110 172315 181760 183040 188221 191984 199936 200512 203060 203645 212080 216320 222443 236288 237952 239980 249920 250640 263978 273776 275704 295360 297440 308480 324896 325832 339328 342220 344630 366080 376442 383968 399872 401024 406120 407290 424160 432640 444886 448019 472576 475904 479960 499840 501280 527956 547552 551408 590720 594880 616960 649792 651664 659945 678656 684440 689260 752884 767936 802048 812240 814580 848320 889772 896038 941105 951808 959920 999680 1002560 1055912 1095104 1102816 1112215 1181440 1189760 1299584 1303328 1319890 1357312 1368880 1378520 1505768 1535872 1604096 1624480 1629160 1696640 1779544 1792076 1882210 1919840 1999360 2005120 2111824 2190208 2205632 2224430 2240095 2362880 2379520 2446873 2599168 2606656 2639780 2737760 2757040 2891759 3011536 3071744 3248960 3258320 3393280 3559088 3584152 3764420 3839680 4010240 4223648 4380416 4411264 4448860 4480190 4759040 4893746 5198336 5213312 5279560 5475520 5514080 5783518 6023072 6143488 6497920 6516640 6786560 7118176 7168304 7528840 7679360 8020480 8447296 8760832 8822528 8897720 8960380 9787492 10426624 10559120 10951040 11028160 11567036 12046144 12234365 12995840 13033280 14236352 14336608 14458795 15057680 15358720 16894592 17645056 17795440 17920760 19574984 20853248 21118240 21902080 22056320 23134072 24092288 24468730 25991680 26066560 28472704 28673216 28917590 30115360 30717440 31809349 33789184 35590880 35841520 39149968 42236480 43804160 44112640 46268144 48184576 48937460 52133120 56945408 57346432 57835180 60230720 63618698 67578368 71181760 71683040 78299936 84472960 88225280 92536288 96369152 97874920 104266240 113890816 114692864 115670360 120461440 127237396 142363520 143366080 156599872 159046745 168945920 185072576 195749840 229385728 231340720 240922880 254474792 284727040 286732160 313199744 318093490 337891840 370145152 391499680 462681440 481845760 508949584 569454080 573464320 626399488 636186980 740290304 782999360 925362880 1017899168 1146928640 1252798976 1272373960 1480580608 1565998720 1850725760 2035798336 2544747920 3131997440 3701451520 4071596672 5089495840 6263994880 7402903040 8143193344 10178991680 16286386688 20357983360 40715966720 81431933440
• Sum of all divisors σ(n): 234858932352
• Sum of proper divisors (its aliquot sum) s(n): 153426998912
• 81431933440 is an abundant number, because the sum of its proper divisors (153426998912) is greater than itself. Its abundance is 71995065472

Bases of 81431933440

• Binary: 1001011110101101110001011001000000000₂
• Hexadecimal: 0x12F5B8B200
• Base-36: 11EQGXZ4

Squares and roots of 81431933440

• 81431933440 squared (81431933440²) is 6631159783776590233600
• 81431933440 cubed (81431933440³) is 539988162142500087732669251584000
• The square root of 81431933440 is 285362.8101908165
• The cube root of 81431933440 is 4334.4258933993

Scales and comparisons

• 81,431,933,440 seconds is equal to 2,589 years, 14 weeks, 5 days, 5 hours, 30 minutes, 40 seconds.
• To count from 1 to 81,431,933,440 would take you about five thousand, one hundred seventy-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 81431933440 cubic inches would be around 361.2 feet tall.

Recreational maths with 81431933440

• 81431933440 backwards is 04433913418
• 81431933440 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81431933440's digits is 40
• More coming soon!