81072391680

Names of 81072391680

• Cardinal: 81072391680 can be written as Eighty-one billion, seventy-two million, three hundred ninety-one thousand, six hundred eighty.

Scientific notation

• Scientific notation: 8.107239168 × 10¹⁰

Factors of 81072391680

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 726

Divisors of 81072391680

• Number of divisors d(n): 360
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 28 30 32 35 36 40 42 45 48 56 60 63 64 70 72 80 84 90 96 105 112 120 126 128 140 144 160 168 180 192 210 224 240 252 256 280 288 315 320 336 360 384 420 448 480 504 512 560 576 630 640 672 709 720 768 840 896 960 1008 1120 1152 1260 1280 1344 1418 1440 1536 1680 1792 1920 2016 2127 2240 2304 2520 2560 2688 2836 2880 3360 3545 3584 3840 4032 4254 4480 4608 4963 5040 5376 5672 5760 6381 6720 7090 7680 8064 8508 8960 9926 10080 10635 10752 11344 11520 12762 13440 14180 14889 16128 17016 17920 19852 20160 21270 22688 23040 24815 25524 26880 28360 29778 31905 32256 34032 39704 40320 42540 44667 45376 49630 51048 53760 56720 59556 63810 68064 74445 79408 80640 85080 89334 90752 99260 102096 113440 119112 127620 136128 148890 158816 161280 170160 178668 181504 198520 204192 223335 226880 238224 255240 272256 297780 317632 340320 357336 363008 397040 408384 446670 453760 476448 502681 510480 544512 595560 635264 680640 714672 794080 816768 893340 907520 952896 1005362 1020960 1089024 1191120 1270528 1361280 1429344 1508043 1588160 1633536 1786680 1815040 1905792 2010724 2041920 2382240 2513405 2541056 2722560 2858688 3016086 3176320 3267072 3518767 3573360 3811584 4021448 4083840 4524129 4764480 5026810 5445120 5717376 6032172 6352640 7037534 7146720 7540215 7623168 8042896 8167680 9048258 9528960 10053620 10556301 11434752 12064344 12705280 14075068 14293440 15080430 16085792 16335360 17593835 18096516 19057920 20107240 21112602 22620645 22869504 24128688 28150136 28586880 30160860 31668903 32171584 35187670 36193032 38115840 40214480 42225204 45241290 48257376 52781505 56300272 57173760 60321720 63337806 64343168 70375340 72386064 80428960 84450408 90482580 96514752 105563010 112600544 114347520 120643440 126675612 128686336 140750680 144772128 158344515 160857920 168900816 180965160 193029504 211126020 225201088 241286880 253351224 257372672 281501360 289544256 316689030 321715840 337801632 361930320 386059008 422252040 450402176 482573760 506702448 563002720 579088512 633378060 643431680 675603264 723860640 772118016 844504080 900804352 965147520 1013404896 1126005440 1158177024 1266756120 1286863360 1351206528 1447721280 1689008160 1801608704 1930295040 2026809792 2252010880 2316354048 2533512240 2702413056 2895442560 3378016320 3860590080 4053619584 4504021760 5067024480 5404826112 5790885120 6756032640 8107239168 9008043520 10134048960 11581770240 13512065280 16214478336 20268097920 27024130560 40536195840 81072391680
• Sum of all divisors σ(n): 321340651632
• Sum of proper divisors (its aliquot sum) s(n): 240268259952
• 81072391680 is an abundant number, because the sum of its proper divisors (240268259952) is greater than itself. Its abundance is 159195868272

Bases of 81072391680

• Binary: 1001011100000010010101000011000000000₂
• Hexadecimal: 0x12E04A8600
• Base-36: 118SEPS0

Squares and roots of 81072391680

• 81072391680 squared (81072391680²) is 6572732692715333222400
• 81072391680 cubed (81072391680³) is 532867159271758577748129349632000
• The square root of 81072391680 is 284732.1402300767
• The cube root of 81072391680 is 4328.0373008129

Scales and comparisons

• 81,072,391,680 seconds is equal to 2,577 years, 44 weeks, 1 day, 20 hours, 48 minutes.
• To count from 1 to 81,072,391,680 would take you about five thousand, one hundred fifty-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 81072391680 cubic inches would be around 360.7 feet tall.

Recreational maths with 81072391680

• 81072391680 backwards is 08619327018
• 81072391680 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81072391680's digits is 45
• More coming soon!