81390315240

Names of 81390315240

• Cardinal: 81390315240 can be written as Eighty-one billion, three hundred ninety million, three hundred fifteen thousand, two hundred forty.

Scientific notation

• Scientific notation: 8.139031524 × 10¹⁰

Factors of 81390315240

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 4656

Divisors of 81390315240

• Number of divisors d(n): 512
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 27 30 31 36 39 40 41 45 52 54 60 62 65 72 78 82 90 93 104 108 117 120 123 124 130 135 155 156 164 180 186 195 205 216 234 246 248 260 270 279 310 312 328 351 360 369 372 390 403 410 465 468 492 520 533 540 558 585 615 620 702 738 744 780 806 820 837 930 936 984 1066 1080 1107 1116 1170 1209 1230 1240 1271 1395 1404 1476 1560 1599 1612 1640 1674 1755 1845 1860 2015 2132 2214 2232 2340 2418 2460 2542 2665 2790 2808 2952 3198 3224 3348 3510 3627 3690 3720 3813 4030 4185 4264 4428 4561 4680 4797 4836 4920 5084 5330 5535 5580 6045 6355 6396 6696 7020 7254 7380 7626 7995 8060 8370 8856 9122 9594 9672 10168 10660 10881 11070 11160 11439 12090 12710 12792 13683 14040 14391 14508 14760 15252 15990 16120 16523 16740 18135 18244 19065 19188 21320 21762 22140 22805 22878 23985 24180 25420 27366 28782 29016 30504 31980 33046 33480 34317 36270 36488 38130 38376 41049 43524 44280 45610 45756 47970 48360 49569 50840 54405 54732 57195 57564 59293 63960 66092 68415 68634 71955 72540 76260 82098 82615 87048 91220 91512 95940 99138 108810 109464 114390 115128 118586 123147 132184 136830 137268 141391 143910 145080 148707 152520 164196 165230 171585 177879 182440 187001 191880 198276 205245 217620 228780 237172 246294 247845 273660 274536 282782 287820 296465 297414 328392 330460 343170 355758 374002 396552 410490 424173 435240 446121 457560 474344 492588 495690 533637 547320 561003 565564 575640 592930 594828 615735 660920 686340 706955 711516 743535 748004 820980 848346 889395 892242 935005 985176 991380 1067274 1122006 1131128 1185860 1189656 1231470 1272519 1372680 1413910 1423032 1487070 1496008 1600911 1641960 1683009 1696692 1778790 1784484 1838083 1870010 1982760 2120865 2134548 2230605 2244012 2371720 2431013 2462940 2545038 2668185 2805015 2827820 2974140 3201822 3366018 3393384 3557580 3568968 3676166 3740020 3817557 4241730 4269096 4461210 4488024 4862026 4925880 5049027 5090076 5336370 5514249 5610030 5655640 5797031 5948280 6362595 6403644 6732036 7115160 7293039 7352332 7480040 7635114 8004555 8415045 8483460 8922420 9190415 9724052 10098054 10180152 10672740 11028498 11220060 11594062 12155065 12725190 12807288 13464072 14586078 14704664 15270228 16009110 16542747 16830090 16966920 17391093 17844840 18380830 19087785 19448104 20196108 21345480 21879117 22056996 22440120 23188124 24310130 25245135 25450380 27571245 28985155 29172156 30540456 32018220 33085494 33660180 34782186 36465195 36761660 38175570 40392216 43758234 44113992 46376248 48620260 49628241 50490270 50900760 52173279 55142490 57970310 58344312 64036440 65637351 66170988 67320360 69564372 72930390 73523320 75361403 76351140 82713735 86955465 87516468 97240520 99256482 100980540 104346558 109395585 110284980 115940620 131274702 132341976 139128744 145860780 150722806 152702280 156519837 165427470 173910930 175032936 198512964 201961080 208693116 218791170 220569960 226084209 231881240 248141205 260866395 262549404 291721560 301445612 313039674 328186755 330854940 347821860 376807015 397025928 417386232 437582340 452168418 496282410 521732790 525098808 602891224 626079348 656373510 661709880 678252627 695643720 753614030 782599185 875164680 904336836 992564820 1043465580 1130421045 1252158696 1312747020 1356505254 1507228060 1565198370 1808673672 1985129640 2034757881 2086931160 2260842090 2625494040 2713010508 3014456120 3130396740 3391263135 4069515762 4521684180 5426021016 6260793480 6782526270 8139031524 9043368360 10173789405 13565052540 16278063048 20347578810 27130105080 40695157620 81390315240
• Sum of all divisors σ(n): 309018931200
• Sum of proper divisors (its aliquot sum) s(n): 227628615960
• 81390315240 is an abundant number, because the sum of its proper divisors (227628615960) is greater than itself. Its abundance is 146238300720

Bases of 81390315240

• Binary: 1001011110011001111011010011011101000₂
• Hexadecimal: 0x12F33DA6E8
• Base-36: 11E1OX60

Squares and roots of 81390315240

• 81390315240 squared (81390315240²) is 6624383414866576257600
• 81390315240 cubed (81390315240³) is 539160654406618344145563445824000
• The square root of 81390315240 is 285289.8793157585
• The cube root of 81390315240 is 4333.6873553501

Scales and comparisons

• 81,390,315,240 seconds is equal to 2,587 years, 49 weeks, 6 days, 12 hours, 54 minutes.
• To count from 1 to 81,390,315,240 would take you about five thousand, one hundred seventy-five 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 81390315240 cubic inches would be around 361.1 feet tall.

Recreational maths with 81390315240

• 81390315240 backwards is 04251309318
• 81390315240 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81390315240's digits is 36
• More coming soon!