81990426661728

Names of 81990426661728

• Cardinal: 81990426661728 can be written as Eighty-one trillion, nine hundred ninety billion, four hundred twenty-six million, six hundred sixty-one thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1990426661728 × 10¹³

Factors of 81990426661728

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 3577

Divisors of 81990426661728

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 6 8 12 13 16 24 26 32 37 39 48 52 74 78 96 104 111 148 156 208 222 296 312 416 444 481 592 624 809 888 962 1184 1248 1443 1618 1776 1924 2427 2713 2886 3236 3552 3848 4854 5426 5772 6472 7696 8139 9708 10517 10852 11544 12944 15392 16278 19416 21034 21704 23088 25888 29933 31551 32556 35269 38832 42068 43408 46176 59866 63102 65112 70538 77664 84136 86816 89799 100381 105807 119732 126204 130224 141076 168272 179598 200762 211614 239464 252408 260448 282152 301143 336544 359196 389129 401524 423228 478928 504816 564304 602286 654481 718392 778258 803048 846456 957856 1009632 1128608 1167387 1204572 1304953 1308962 1436784 1556516 1606096 1692912 1963443 2194817 2334774 2409144 2609906 2617924 2873568 3113032 3212192 3385824 3914859 3926886 4389634 4669548 4818288 5219812 5235848 6226064 6584451 7829718 7853772 8508253 8779268 9339096 9636576 10439624 10471696 12452128 13168902 15659436 15707544 17016506 17558536 18678192 20879248 20943392 24215797 25524759 26337804 28532621 31318872 31415088 34033012 35117072 37356384 41758496 48431594 51049518 52675608 57065242 62637744 62830176 68066024 70234144 72647391 81208229 85597863 96863188 102099036 105351216 114130484 125275488 136132048 145294782 162416458 171195726 193726376 204198072 210702432 228260968 243624687 272264096 290589564 314805361 324832916 342391452 387452752 408396144 456521936 487249374 581179128 629610722 649665832 684782904 774905504 816792288 913043872 944416083 974498748 1055706977 1162358256 1259221444 1299331664 1369565808 1775606953 1888832166 1948997496 2111413954 2324716512 2518442888 2598663328 2739131616 3167120931 3551213906 3777664332 3897994992 4222827908 5036885776 5326820859 6334241862 7102427812 7555328664 7795989984 8445655816 10073771552 10653641718 12668483724 14204855624 15110657328 16891311632 21307283436 23082890389 25336967448 28409711248 30221314656 33782623264 42614566872 46165780778 50673934896 56819422496 65697457261 69248671167 85229133744 92331561556 101347869792 131394914522 138497342334 170458267488 184663123112 197092371783 262789829044 276994684668 369326246224 394184743566 525579658088 553989369336 738652492448 788369487132 854066944393 1051159316176 1107978738672 1576738974264 1708133888786 2102318632352 2215957477344 2562200833179 3153477948528 3416267777572 5124401666358 6306955897056 6832535555144 10248803332716 13665071110288 20497606665432 27330142220576 40995213330864 81990426661728
• Sum of all divisors σ(n): 238427431141536
• Sum of proper divisors (its aliquot sum) s(n): 156437004479808
• 81990426661728 is an abundant number, because the sum of its proper divisors (156437004479808) is greater than itself. Its abundance is 74446577818080

Bases of 81990426661728

• Binary: 10010101001000111100010010000011001001101100000₂
• Hexadecimal: 0x4A91E2419360
• Base-36: T29VR3R6O

Squares and roots of 81990426661728

• 81990426661728 squared (81990426661728²) is 6722430064172197670139945984
• 81990426661728 cubed (81990426661728³) is 551174909165106025835521670711515360100352
• The square root of 81990426661728 is 9054856.5235307843
• The cube root of 81990426661728 is 43443.1240930703

Scales and comparisons

• 81,990,426,661,728 seconds is equal to 2,607,041 years, 49 weeks, 4 days, 13 hours, 8 minutes, 48 seconds.
• To count from 1 to 81,990,426,661,728 would take you about six million, five hundred seventeen thousand, six hundred four 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 81990426661728 cubic inches would be around 3620.3 feet tall.

Recreational maths with 81990426661728

• 81990426661728 backwards is 82716662409918
• The number of decimal digits it has is: 14
• The sum of 81990426661728's digits is 69
• More coming soon!