81333140

Names of 81333140

• Cardinal: 81333140 can be written as Eighty-one million, three hundred thirty-three thousand, one hundred forty.

Scientific notation

• Scientific notation: 8.133314 × 10⁷

Factors of 81333140

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 720

Divisors of 81333140

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 4 5 7 10 14 20 28 35 49 70 98 140 149 196 245 298 490 557 596 745 980 1043 1114 1490 2086 2228 2785 2980 3899 4172 5215 5570 7301 7798 10430 11140 14602 15596 19495 20860 27293 29204 36505 38990 54586 73010 77980 82993 109172 136465 146020 165986 272930 331972 414965 545860 580951 829930 1161902 1659860 2323804 2904755 4066657 5809510 8133314 11619020 16266628 20333285 40666570 81333140
• Sum of all divisors σ(n): 200377800
• Sum of proper divisors (its aliquot sum) s(n): 119044660
• 81333140 is an abundant number, because the sum of its proper divisors (119044660) is greater than itself. Its abundance is 37711520

Bases of 81333140

• Binary: 100110110010000101110010100₂
• Hexadecimal: 0x4D90B94
• Base-36: 1CF91W

Squares and roots of 81333140

• 81333140 squared (81333140²) is 6615079662259600
• 81333140 cubed (81333140³) is 538025200281712763144000
• The square root of 81333140 is 9018.4887869309
• The cube root of 81333140 is 433.2672338363

Scales and comparisons

• 81,333,140 seconds is equal to 2 years, 30 weeks, 3 days, 8 hours, 32 minutes, 20 seconds.
• To count from 1 to 81,333,140 would take you about three 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 81333140 cubic inches would be around 36.1 feet tall.

Recreational maths with 81333140

• 81333140 backwards is 04133318
• The number of decimal digits it has is: 8
• The sum of 81333140's digits is 23
• More coming soon!