81989421672

Names of 81989421672

• Cardinal: 81989421672 can be written as Eighty-one billion, nine hundred eighty-nine million, four hundred twenty-one thousand, six hundred seventy-two.

Scientific notation

• Scientific notation: 8.1989421672 × 10¹⁰

Factors of 81989421672

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 3622790

Divisors of 81989421672

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 4 6 8 12 23 24 41 46 69 82 92 123 138 164 184 246 276 328 492 552 943 984 1886 2829 3772 5658 7544 11316 22632 3622721 7245442 10868163 14490884 21736326 28981768 43472652 83322583 86945304 148531561 166645166 249967749 297063122 333290332 445594683 499935498 594126244 666580664 891189366 999870996 1188252488 1782378732 1999741992 3416225903 3564757464 6832451806 10248677709 13664903612 20497355418 27329807224 40994710836 81989421672
• Sum of all divisors σ(n): 219102226560
• Sum of proper divisors (its aliquot sum) s(n): 137112804888
• 81989421672 is an abundant number, because the sum of its proper divisors (137112804888) is greater than itself. Its abundance is 55123383216

Bases of 81989421672

• Binary: 1001100010110111100110100101001101000₂
• Hexadecimal: 0x1316F34A68
• Base-36: 11NYDUNC

Squares and roots of 81989421672

• 81989421672 squared (81989421672²) is 6722265266109023275584
• 81989421672 cubed (81989421672³) is 551154641494052000065919238056448
• The square root of 81989421672 is 286337.9501079103
• The cube root of 81989421672 is 4344.2946592379

Scales and comparisons

• 81,989,421,672 seconds is equal to 2,607 years, 3 days, 15 hours, 21 minutes, 12 seconds.
• To count from 1 to 81,989,421,672 would take you about five thousand, two hundred fourteen 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 81989421672 cubic inches would be around 362 feet tall.

Recreational maths with 81989421672

• 81989421672 backwards is 27612498918
• The number of decimal digits it has is: 11
• The sum of 81989421672's digits is 57
• More coming soon!