81090

Names of 81090

• Cardinal: 81090 can be written as Eighty-one thousand and ninety.

Scientific notation

• Scientific notation: 8.109 × 10⁴

Factors of 81090

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 80

Divisors of 81090

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 5 6 9 10 15 17 18 30 34 45 51 53 85 90 102 106 153 159 170 255 265 306 318 477 510 530 765 795 901 954 1530 1590 1802 2385 2703 4505 4770 5406 8109 9010 13515 16218 27030 40545 81090
• Sum of all divisors σ(n): 227448
• Sum of proper divisors (its aliquot sum) s(n): 146358
• 81090 is an abundant number, because the sum of its proper divisors (146358) is greater than itself. Its abundance is 65268

Bases of 81090

• Binary: 10011110011000010₂
• Hexadecimal: 0x13CC2
• Base-36: 1QKI

Squares and roots of 81090

• 81090 squared (81090²) is 6575588100
• 81090 cubed (81090³) is 533214439029000
• The square root of 81090 is 284.7630594021
• The cube root of 81090 is 43.2835061729

Scales and comparisons

• 81,090 seconds is equal to 22 hours, 31 minutes, 30 seconds.
• To count from 1 to 81,090 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 81090 cubic inches would be around 3.6 feet tall.

Recreational maths with 81090

• 81090 backwards is 09018
• 81090 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 81090's digits is 18
• More coming soon!