81321385744

Names of 81321385744

• Cardinal: 81321385744 can be written as Eighty-one billion, three hundred twenty-one million, three hundred eighty-five thousand, seven hundred forty-four.

Scientific notation

• Scientific notation: 8.1321385744 × 10¹⁰

Factors of 81321385744

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 2051

Divisors of 81321385744

• Number of divisors d(n): 60
• Complete list of divisors:
  1 2 4 8 16 127 181 254 362 508 724 1016 1448 1741 2032 2896 3482 6964 13928 16129 22987 27856 32258 45974 64516 91948 129032 183896 221107 258064 315121 367792 442214 630242 884428 1260484 1768856 2520968 2919349 3537712 5041936 5838698 11677396 23354792 28080589 40020367 46709584 56161178 80040734 112322356 160081468 224644712 320162936 449289424 640325872 5082586609 10165173218 20330346436 40660692872 81321385744
• Sum of all divisors σ(n): 159779713548
• Sum of proper divisors (its aliquot sum) s(n): 78458327804
• 81321385744 is a deficient number, because the sum of its proper divisors (78458327804) is less than itself. Its deficiency is 2863057940

Bases of 81321385744

• Binary: 1001011101111001000011101111100010000₂
• Hexadecimal: 0x12EF21DF10
• Base-36: 11CWNITS

Squares and roots of 81321385744

• 81321385744 squared (81321385744²) is 6613167779324446433536
• 81321385744 cubed (81321385744³) is 537791967972235176150846113910784
• The square root of 81321385744 is 285169.0476612073
• The cube root of 81321385744 is 4332.4636092059

Scales and comparisons

• 81,321,385,744 seconds is equal to 2,585 years, 39 weeks, 6 days, 17 hours, 49 minutes, 4 seconds.
• To count from 1 to 81,321,385,744 would take you about five thousand, one hundred seventy-one 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 81321385744 cubic inches would be around 361 feet tall.

Recreational maths with 81321385744

• 81321385744 backwards is 44758312318
• The number of decimal digits it has is: 11
• The sum of 81321385744's digits is 46
• More coming soon!