81424739

Names of 81424739

• Cardinal: 81424739 can be written as Eighty-one million, four hundred twenty-four thousand, seven hundred thirty-nine.

Scientific notation

• Scientific notation: 8.1424739 × 10⁷

Factors of 81424739

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 19921

Divisors of 81424739

• Number of divisors d(n): 8
• Complete list of divisors:
  1 11 379 4169 19531 214841 7402249 81424739
• Sum of all divisors σ(n): 89065920
• Sum of proper divisors (its aliquot sum) s(n): 7641181
• 81424739 is a deficient number, because the sum of its proper divisors (7641181) is less than itself. Its deficiency is 73783558

Bases of 81424739

• Binary: 100110110100111000101100011₂
• Hexadecimal: 0x4DA7163
• Base-36: 1CH7QB

Squares and roots of 81424739

• 81424739 squared (81424739²) is 6629988121218121
• 81424739 cubed (81424739³) is 539845052343285864495419
• The square root of 81424739 is 9023.5657586123
• The cube root of 81424739 is 433.4298242063

Scales and comparisons

• 81,424,739 seconds is equal to 2 years, 30 weeks, 4 days, 9 hours, 58 minutes, 59 seconds.
• To count from 1 to 81,424,739 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 81424739 cubic inches would be around 36.1 feet tall.

Recreational maths with 81424739

• 81424739 backwards is 93742418
• The number of decimal digits it has is: 8
• The sum of 81424739's digits is 38
• More coming soon!