81987137993973760

Names of 81987137993973760

• Cardinal: 81987137993973760 can be written as Eighty-one quadrillion, nine hundred eighty-seven trillion, one hundred thirty-seven billion, nine hundred ninety-three million, nine hundred seventy-three thousand, seven hundred sixty.

Scientific notation

• Scientific notation: 8.198713799397376 × 10¹⁶

Factors of 81987137993973760

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 18
• Sum of prime factors: 134387

Divisors of 81987137993973760

• Number of divisors d(n): 448
• Complete list of divisors:
  1 2 4 5 8 10 16 20 32 40 61 64 79 80 122 128 158 160 244 256 305 316 320 395 488 512 610 632 640 790 976 1024 1220 1264 1280 1580 1952 2048 2440 2528 2560 3160 3169 3904 4096 4819 4880 5056 5120 6320 6338 7808 8192 9638 9760 10112 10240 12640 12676 15616 15845 19276 19520 20224 20480 24095 25280 25352 31232 31690 38552 39040 40448 40960 48190 50560 50704 62464 63380 77104 78080 80896 96380 101120 101408 124928 126760 131071 154208 156160 161792 192760 193309 202240 202816 249856 250351 253520 262142 308416 312320 323584 385520 386618 404480 405632 499712 500702 507040 524284 616832 624640 647168 655355 771040 773236 808960 811264 966545 1001404 1014080 1048568 1233664 1249280 1251755 1310710 1542080 1546472 1617920 1622528 1933090 2002808 2028160 2097136 2467328 2498560 2503510 2621420 3084160 3092944 3235840 3245056 3866180 4005616 4056320 4194272 4934656 5007020 5242840 6168320 6185888 6490112 7732360 7995331 8011232 8112640 8388544 9869312 10014040 10354609 10485680 12336640 12371776 12980224 15271411 15464720 15990662 16022464 16225280 16777088 19738624 20028080 20709218 20971360 24673280 24743552 25960448 30542822 30929440 31981324 32044928 32450560 33554176 39477248 39976655 40056160 41418436 41942720 49346560 49487104 51773045 61085644 61858880 63962648 64089856 64901120 67108352 76357055 79953310 80112320 82836872 83885440 98693120 98974208 103546090 122171288 123717760 127925296 128179712 129802240 134216704 152714110 159906620 160224640 165673744 167770880 197386240 197948416 207092180 244342576 247435520 255850592 256359424 268433408 305428220 319813240 320449280 331347488 335541760 395896832 414184360 415363999 488685152 494871040 511701184 512718848 536866816 610856440 631631149 639626480 640898560 662694976 671083520 791793664 828368720 830727998 977370304 989742080 1023402368 1025437696 1073733632 1221712880 1263262298 1279252960 1281797120 1325389952 1342167040 1583587328 1656737440 1661455996 1954740608 1979484160 2046804736 2050875392 2076819995 2443425760 2526524596 2558505920 2563594240 2650779904 2684334080 3158155745 3313474880 3322911992 3909481216 3958968320 4093609472 4153639990 4886851520 5053049192 5117011840 5127188480 5301559808 5368668160 6316311490 6626949760 6645823984 7818962432 7917936640 8187218944 8307279980 9773703040 10106098384 10234023680 10254376960 10603119616 12632622980 13253899520 13291647968 15637924864 16374437888 16614559960 19547406080 20212196768 20468047360 21206239232 25265245960 25337203939 26507799040 26583295936 31275849728 32748875776 32813755921 33229119920 39094812160 40424393536 40936094720 42412478464 50530491920 50674407878 53015598080 53166591872 62551699456 65497751552 65627511842 66458239840 78189624320 80848787072 81872189440 84824956928 101060983840 101348815756 106031196160 106333183744 125103398912 126686019695 131255023684 132916479680 156379248640 161697574144 163744378880 164068779605 202121967680 202697631512 212062392320 212666367488 253372039390 262510047368 265832959360 312758497280 323395148288 327488757760 328137559210 404243935360 405395263024 424124784640 425332734976 506744078780 525020094736 531665918720 625516994560 646790296576 656275118420 808487870720 810790526048 850665469952 1013488157560 1050040189472 1063331837440 1293580593152 1312550236840 1616975741440 1621581052096 1701330939904 2001639111181 2026976315120 2100080378944 2126663674880 2587161186304 2625100473680 3233951482880 3243162104192 3402661879808 4003278222362 4053952630240 4200160757888 4253327349760 5174322372608 5250200947360 6467902965760 6486324208384 8006556444724 8107905260480 8400321515776 8506654699520 10008195555905 10500401894720 12935805931520 12972648416768 16013112889448 16215810520960 16800643031552 17013309399040 20016391111810 21000803789440 25871611863040 25945296833536 32026225778896 32431621041920 33601286063104 40032782223620 42001607578880 51890593667072 64052451557792 64863242083840 67202572126208 80065564447240 84003215157760 103781187334144 128104903115584 129726484167680 134405144252416 160131128894480 168006430315520 207562374668288 256209806231168 259452968335360 268810288504832 320262257788960 336012860631040 512419612462336 518905936670720 640524515577920 672025721262080 1024839224924672 1037811873341440 1281049031155840 1344051442524160 2049678449849344 2562098062311680 4099356899698688 5124196124623360 8198713799397376 10248392249246720 16397427598794752 20496784498493440 40993568996986880 81987137993973760
• Sum of all divisors σ(n): 202579524137779200
• Sum of proper divisors (its aliquot sum) s(n): 120592386143805440
• 81987137993973760 is an abundant number, because the sum of its proper divisors (120592386143805440) is greater than itself. Its abundance is 38605248149831680

Bases of 81987137993973760

• Binary: 100100011010001101101111000011100010010000010000000000000₂
• Hexadecimal: 0x12346DE1C482000
• Base-36: MFA0J8CFTOG

Squares and roots of 81987137993973760

• 81987137993973760 squared (81987137993973760²) is 6721890796442895659034075568537600
• 81987137993973760 cubed (81987137993973760³) is 551108588308385868323671664803823161834655973376000
• The square root of 81987137993973760 is 286333962.3481185299
• The cube root of 81987137993973760 is 434425.4324512913

Scales and comparisons

• 81,987,137,993,973,760 seconds is equal to 2,606,937,385 years, 17 weeks, 4 days, 14 hours, 2 minutes, 40 seconds.
• To count from 1 to 81,987,137,993,973,760 would take you about seven billion, eight hundred twenty million, eight hundred twelve thousand, one hundred fifty-six 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 81987137993973760 cubic inches would be around 36202.1 feet tall.

Recreational maths with 81987137993973760

• 81987137993973760 backwards is 06737939973178918
• The number of decimal digits it has is: 17
• The sum of 81987137993973760's digits is 97
• More coming soon!