81615676842

Names of 81615676842

• Cardinal: 81615676842 can be written as Eighty-one billion, six hundred fifteen million, six hundred seventy-six thousand, eight hundred forty-two.

Scientific notation

• Scientific notation: 8.1615676842 × 10¹⁰

Factors of 81615676842

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 30844939

Divisors of 81615676842

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 6 7 9 14 18 21 27 42 49 54 63 98 126 147 189 294 378 441 882 1323 2646 30844927 61689854 92534781 185069562 215914489 277604343 431828978 555208686 647743467 832813029 1295486934 1511401423 1665626058 1943230401 3022802846 3886460802 4534204269 5829691203 9068408538 11659382406 13602612807 27205225614 40807838421 81615676842
• Sum of all divisors σ(n): 210979307520
• Sum of proper divisors (its aliquot sum) s(n): 129363630678
• 81615676842 is an abundant number, because the sum of its proper divisors (129363630678) is greater than itself. Its abundance is 47747953836

Bases of 81615676842

• Binary: 1001100000000101011000110010110101010₂
• Hexadecimal: 0x1300AC65AA
• Base-36: 11HRV7AI

Squares and roots of 81615676842

• 81615676842 squared (81615676842²) is 6661118706377775092964
• 81615676842 cubed (81615676842³) is 543651711745929576358306331939688
• The square root of 81615676842 is 285684.5757859531
• The cube root of 81615676842 is 4337.6835175223

Scales and comparisons

• 81,615,676,842 seconds is equal to 2,595 years, 6 weeks, 3 days, 21 hours, 20 minutes, 42 seconds.
• To count from 1 to 81,615,676,842 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 81615676842 cubic inches would be around 361.5 feet tall.

Recreational maths with 81615676842

• 81615676842 backwards is 24867651618
• 81615676842 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81615676842's digits is 54
• More coming soon!