81808

Names of 81808

• Cardinal: 81808 can be written as Eighty-one thousand, eight hundred eight.

Scientific notation

• Scientific notation: 8.1808 × 10⁴

Factors of 81808

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 5115

Divisors of 81808

• Number of divisors d(n): 10
• Complete list of divisors:
  1 2 4 8 16 5113 10226 20452 40904 81808
• Sum of all divisors σ(n): 158534
• Sum of proper divisors (its aliquot sum) s(n): 76726
• 81808 is a deficient number, because the sum of its proper divisors (76726) is less than itself. Its deficiency is 5082

Bases of 81808

• Binary: 10011111110010000₂
• Hexadecimal: 0x13F90
• Base-36: 1R4G

Squares and roots of 81808

• 81808 squared (81808²) is 6692548864
• 81808 cubed (81808³) is 547504037466112
• The square root of 81808 is 286.0209782515
• The cube root of 81808 is 43.4108802101

Scales and comparisons

• 81,808 seconds is equal to 22 hours, 43 minutes, 28 seconds.
• To count from 1 to 81,808 would take you about twenty-two hours.

  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 81808 cubic inches would be around 3.6 feet tall.

Recreational maths with 81808

• 81808 backwards is 80818
• The number of decimal digits it has is: 5
• The sum of 81808's digits is 25
• More coming soon!