81701721390

Names of 81701721390

• Cardinal: 81701721390 can be written as Eighty-one billion, seven hundred one million, seven hundred twenty-one thousand, three hundred ninety.

Scientific notation

• Scientific notation: 8.170172139 × 10¹⁰

Factors of 81701721390

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 6657

Divisors of 81701721390

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 5 6 10 15 30 409 818 1227 1367 2045 2454 2734 4090 4101 4871 6135 6835 8202 9742 12270 13670 14613 20505 24355 29226 41010 48710 73065 146130 559103 1118206 1677309 1992239 2795515 3354618 3984478 5591030 5976717 6658657 8386545 9961195 11953434 13317314 16773090 19922390 19975971 29883585 33293285 39951942 59767170 66586570 99879855 199759710 2723390713 5446781426 8170172139 13616953565 16340344278 27233907130 40850860695 81701721390
• Sum of all divisors σ(n): 196747729920
• Sum of proper divisors (its aliquot sum) s(n): 115046008530
• 81701721390 is an abundant number, because the sum of its proper divisors (115046008530) is greater than itself. Its abundance is 33344287140

Bases of 81701721390

• Binary: 1001100000101110011010101010100101110₂
• Hexadecimal: 0x1305CD552E
• Base-36: 11J73FOU

Squares and roots of 81701721390

• 81701721390 squared (81701721390²) is 6675171278089183532100
• 81701721390 cubed (81701721390³) is 545372983992972684512210321619000
• The square root of 81701721390 is 285835.1297339079
• The cube root of 81701721390 is 4339.2073380525

Scales and comparisons

• 81,701,721,390 seconds is equal to 2,597 years, 44 weeks, 5 days, 18 hours, 36 minutes, 30 seconds.
• To count from 1 to 81,701,721,390 would take you about five thousand, one hundred ninety-five 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 81701721390 cubic inches would be around 361.6 feet tall.

Recreational maths with 81701721390

• 81701721390 backwards is 09312710718
• The number of decimal digits it has is: 11
• The sum of 81701721390's digits is 39
• More coming soon!