81490727808

Names of 81490727808

• Cardinal: 81490727808 can be written as Eighty-one billion, four hundred ninety million, seven hundred twenty-seven thousand, eight hundred eight.

Scientific notation

• Scientific notation: 8.1490727808 × 10¹⁰

Factors of 81490727808

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 286

Divisors of 81490727808

• Number of divisors d(n): 480
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 14 16 17 18 21 24 27 28 32 34 36 42 48 51 54 56 63 64 68 72 81 84 96 102 108 112 119 126 128 136 144 153 162 168 189 192 204 216 224 238 252 257 272 288 306 324 336 357 378 384 408 432 448 459 476 504 514 544 567 576 612 648 672 714 756 771 816 864 896 918 952 1008 1028 1071 1088 1134 1152 1224 1296 1344 1377 1428 1512 1542 1632 1728 1799 1836 1904 2016 2056 2142 2176 2268 2313 2448 2592 2688 2754 2856 3024 3084 3213 3264 3456 3598 3672 3808 4032 4112 4284 4369 4536 4626 4896 5184 5397 5508 5712 6048 6168 6426 6528 6939 7196 7344 7616 8064 8224 8568 8738 9072 9252 9639 9792 10368 10794 11016 11424 12096 12336 12852 13107 13878 14392 14688 15232 16191 16448 17136 17476 18144 18504 19278 19584 20817 21588 22032 22848 24192 24672 25704 26214 27756 28784 29376 30583 32382 32896 34272 34952 36288 37008 38556 39321 41634 43176 44064 45696 48573 49344 51408 52428 55512 57568 58752 61166 64764 66049 68544 69904 72576 74016 77112 78642 83268 86352 88128 91749 97146 98688 102816 104856 111024 115136 117963 122332 129528 132098 137088 139808 145719 148032 154224 157284 166536 172704 176256 183498 194292 198147 205632 209712 222048 230272 235926 244664 259056 264196 275247 279616 291438 296064 308448 314568 333072 345408 353889 366996 388584 396294 411264 419424 444096 462343 471852 489328 518112 528392 550494 559232 582876 594441 616896 629136 666144 690816 707778 733992 777168 792588 825741 838848 888192 924686 943704 978656 1036224 1056784 1100988 1122833 1165752 1188882 1233792 1258272 1332288 1387029 1415556 1467984 1554336 1585176 1651482 1677696 1783323 1849372 1887408 1957312 2072448 2113568 2201976 2245666 2331504 2377764 2477223 2516544 2664576 2774058 2831112 2935968 3108672 3170352 3302964 3368499 3566646 3698744 3774816 3914624 4161087 4227136 4403952 4491332 4663008 4755528 4954446 5033088 5349969 5548116 5662224 5871936 6217344 6340704 6605928 6736998 7133292 7397488 7549632 7859831 8322174 8454272 8807904 8982664 9326016 9511056 9908892 10105497 10699938 11096232 11324448 11743872 12483261 12681408 13211856 13473996 14266584 14794976 15099264 15719662 16644348 17615808 17965328 18652032 19022112 19817784 20210994 21399876 22192464 22648896 23579493 24966522 25362816 26423712 26947992 28533168 29589952 30316491 31439324 33288696 35231616 35930656 37449783 38044224 39635568 40421988 42799752 44384928 45297792 47158986 49933044 52847424 53895984 57066336 59179904 60632982 62878648 66577392 70738479 71861312 74899566 76088448 79271136 80843976 85599504 88769856 90949473 94317972 99866088 105694848 107791968 114132672 121265964 125757296 133154784 141476958 143722624 149799132 158542272 161687952 171199008 177539712 181898946 188635944 199732176 212215437 215583936 228265344 242531928 251514592 266309568 282953916 299598264 317084544 323375904 342398016 363797892 377271888 399464352 424430874 431167872 485063856 503029184 532619136 565907832 599196528 636646311 646751808 684796032 727595784 754543776 798928704 848861748 970127712 1006058368 1131815664 1198393056 1273292622 1293503616 1455191568 1509087552 1597857408 1697723496 1940255424 2263631328 2396786112 2546585244 2910383136 3018175104 3395446992 3880510848 4527262656 4793572224 5093170488 5820766272 6790893984 9054525312 10186340976 11641532544 13581787968 20372681952 27163575936 40745363904 81490727808
• Sum of all divisors σ(n): 294609957840
• Sum of proper divisors (its aliquot sum) s(n): 213119230032
• 81490727808 is an abundant number, because the sum of its proper divisors (213119230032) is greater than itself. Its abundance is 131628502224

Bases of 81490727808

• Binary: 1001011111001001110011101001110000000₂
• Hexadecimal: 0x12F939D380
• Base-36: 11FPH400

Squares and roots of 81490727808

• 81490727808 squared (81490727808²) is 6640738718677544484864
• 81490727808 cubed (81490727808³) is 541158631367798463337863799898112
• The square root of 81490727808 is 285465.8084745001
• The cube root of 81490727808 is 4335.4688033607

Scales and comparisons

• 81,490,727,808 seconds is equal to 2,591 years, 7 weeks, 6 days, 17 hours, 16 minutes, 48 seconds.
• To count from 1 to 81,490,727,808 would take you about five thousand, one hundred eighty-two 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 81490727808 cubic inches would be around 361.3 feet tall.

Recreational maths with 81490727808

• 81490727808 backwards is 80872709418
• 81490727808 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81490727808's digits is 54
• More coming soon!