81621741888

Names of 81621741888

• Cardinal: 81621741888 can be written as Eighty-one billion, six hundred twenty-one million, seven hundred forty-one thousand, eight hundred eighty-eight.

Scientific notation

• Scientific notation: 8.1621741888 × 10¹⁰

Factors of 81621741888

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 164

Divisors of 81621741888

• Number of divisors d(n): 378
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 19 24 32 36 37 38 48 57 64 72 74 76 96 103 111 114 144 148 152 171 192 206 222 228 288 296 304 309 333 342 361 412 444 456 576 592 608 618 666 684 703 722 824 888 912 927 1083 1184 1216 1236 1332 1368 1406 1444 1648 1776 1824 1854 1957 2109 2166 2368 2472 2664 2736 2812 2888 3249 3296 3552 3648 3708 3811 3914 4218 4332 4944 5328 5472 5624 5776 5871 6327 6498 6592 7104 7416 7622 7828 8436 8664 9888 10609 10656 10944 11248 11433 11552 11742 12654 12996 13357 14832 15244 15656 16872 17328 17613 19776 21218 21312 22496 22866 23104 23484 25308 25992 26714 29664 30488 31312 31827 33744 34299 34656 35226 37183 40071 42436 44992 45732 46968 50616 51984 53428 59328 60976 62624 63654 67488 68598 69312 70452 72409 74366 80142 84872 91464 93936 95481 101232 103968 106856 111549 120213 121952 125248 127308 134976 137196 140904 144818 148732 160284 169744 182928 187872 190962 201571 202464 207936 213712 217227 223098 240426 243904 254616 274392 281808 289636 297464 320568 334647 339488 365856 375744 381924 392533 403142 404928 427424 434454 446196 480852 509232 548784 563616 579272 594928 604713 641136 651681 669294 678976 731712 763848 785066 806284 854848 868908 892392 961704 1018464 1097568 1127232 1158544 1177599 1189856 1209426 1282272 1303362 1338588 1375771 1527696 1570132 1612568 1737816 1784784 1814139 1923408 2036928 2195136 2317088 2355198 2379712 2418852 2564544 2606724 2677176 2751542 3055392 3140264 3225136 3475632 3532797 3569568 3628278 3829849 3846816 4127313 4634176 4710396 4837704 5213448 5354352 5503084 6110784 6280528 6450272 6951264 7065594 7139136 7256556 7458127 7659698 7693632 8254626 9420792 9675408 10426896 10708704 11006168 11489547 12381939 12561056 12900544 13902528 14131188 14513112 14916254 15319396 16509252 18841584 19350816 20853792 21417408 22012336 22374381 22979094 24763878 25122112 28262376 29026224 29832508 30638792 33018504 34468641 37683168 38701632 41707584 44024672 44748762 45958188 49527756 56524752 58052448 59665016 61277584 66037008 67123143 68937282 75366336 88049344 89497524 91916376 99055512 113049504 116104896 119330032 122555168 132074016 134246286 137874564 141704413 178995048 183832752 198111024 226099008 238660064 245110336 264148032 268492572 275749128 283408826 357990096 367665504 396222048 425113239 477320128 536985144 551498256 566817652 715980192 735331008 792444096 850226478 1073970288 1102996512 1133635304 1275339717 1431960384 1700452956 2147940576 2205993024 2267270608 2550679434 3400905912 4295881152 4534541216 5101358868 6801811824 9069082432 10202717736 13603623648 20405435472 27207247296 40810870944 81621741888
• Sum of all divisors σ(n): 256074745914
• Sum of proper divisors (its aliquot sum) s(n): 174453004026
• 81621741888 is an abundant number, because the sum of its proper divisors (174453004026) is greater than itself. Its abundance is 92831262138

Bases of 81621741888

• Binary: 1001100000001000010001111000101000000₂
• Hexadecimal: 0x130108F140
• Base-36: 11HVH740

Squares and roots of 81621741888

• 81621741888 squared (81621741888²) is 6662108748831293804544
• 81621741888 cubed (81621741888³) is 543772920726894484571583889539072
• The square root of 81621741888 is 285695.1905230467
• The cube root of 81621741888 is 4337.7909625599

Scales and comparisons

• 81,621,741,888 seconds is equal to 2,595 years, 16 weeks, 4 days, 2 hours, 4 minutes, 48 seconds.
• To count from 1 to 81,621,741,888 would take you about five thousand, one hundred ninety 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 81621741888 cubic inches would be around 361.5 feet tall.

Recreational maths with 81621741888

• 81621741888 backwards is 88814712618
• The number of decimal digits it has is: 11
• The sum of 81621741888's digits is 54
• More coming soon!