81537721799490

Names of 81537721799490

• Cardinal: 81537721799490 can be written as Eighty-one trillion, five hundred thirty-seven billion, seven hundred twenty-one million, seven hundred ninety-nine thousand, four hundred ninety.

Scientific notation

• Scientific notation: 8.153772179949 × 10¹³

Factors of 81537721799490

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 5981142

Divisors of 81537721799490

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 5 6 9 10 11 15 18 22 30 33 45 47 55 66 90 94 99 110 141 165 198 235 282 293 330 423 470 495 517 586 705 846 879 990 1034 1410 1465 1551 1758 2115 2585 2637 2930 3102 3223 4230 4395 4653 5170 5274 6446 7755 8790 9306 9669 13185 13771 15510 16115 19338 23265 26370 27542 29007 32230 41313 46530 48345 58014 68855 82626 96690 123939 137710 145035 151481 206565 247878 290070 302962 413130 454443 619695 757405 908886 1239390 1363329 1514810 2272215 2726658 4544430 5980781 6816645 11961562 13633290 17942343 29903905 35884686 53827029 59807810 65788591 89711715 107654058 131577182 179423430 197365773 269135145 281096707 328942955 394731546 538270290 562193414 592097319 657885910 843290121 986828865 1184194638 1405483535 1686580242 1752368833 1973657730 2529870363 2810967070 2960486595 3092063777 3504737666 4216450605 5059740726 5257106499 5920973190 6184127554 8432901210 8761844165 9276191331 10514212998 12649351815 15460318885 15771319497 17523688330 18552382662 19276057163 25298703630 26285532495 27828573993 30920637770 31542638994 38552114326 46380956655 52571064990 55657147986 57828171489 78856597485 82361335151 92761913310 96380285815 115656342978 139142869965 157713194970 164722670302 173484514467 192760571630 247084005453 278285739930 289140857445 346969028934 411806675755 494168010906 578281714890 741252016359 823613351510 867422572335 905974686661 1235420027265 1482504032718 1734845144670 1811949373322 2470840054530 2717924059983 3706260081795 4529873433305 5435848119966 7412520163590 8153772179949 9059746866610 13589620299915 16307544359898 27179240599830 40768860899745 81537721799490
• Sum of all divisors σ(n): 236997433999872
• Sum of proper divisors (its aliquot sum) s(n): 155459712200382
• 81537721799490 is an abundant number, because the sum of its proper divisors (155459712200382) is greater than itself. Its abundance is 73921990400892

Bases of 81537721799490

• Binary: 10010100010100001111010111100011001001101000010₂
• Hexadecimal: 0x4A287AF19342
• Base-36: SWHWUBFWI

Squares and roots of 81537721799490

• 81537721799490 squared (81537721799490²) is 6648400076251026763764260100
• 81537721799490 cubed (81537721799490³) is 542095395829064323189276537167120407349000
• The square root of 81537721799490 is 9029824.0181904985
• The cube root of 81537721799490 is 43363.0203448477

Scales and comparisons

• 81,537,721,799,490 seconds is equal to 2,592,647 years, 17 weeks, 4 days, 22 hours, 31 minutes, 30 seconds.
• To count from 1 to 81,537,721,799,490 would take you about six million, four hundred eighty-one thousand, six hundred eighteen 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 81537721799490 cubic inches would be around 3613.6 feet tall.

Recreational maths with 81537721799490

• 81537721799490 backwards is 09499712773518
• The number of decimal digits it has is: 14
• The sum of 81537721799490's digits is 72
• More coming soon!