81018

Names of 81018

• Cardinal: 81018 can be written as Eighty-one thousand and eighteen.

Scientific notation

• Scientific notation: 8.1018 × 10⁴

Factors of 81018

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 655

Divisors of 81018

• Number of divisors d(n): 24
• Complete list of divisors:
  1 2 3 6 7 9 14 18 21 42 63 126 643 1286 1929 3858 4501 5787 9002 11574 13503 27006 40509 81018
• Sum of all divisors σ(n): 200928
• Sum of proper divisors (its aliquot sum) s(n): 119910
• 81018 is an abundant number, because the sum of its proper divisors (119910) is greater than itself. Its abundance is 38892

Bases of 81018

• Binary: 10011110001111010₂
• Hexadecimal: 0x13C7A
• Base-36: 1QII

Squares and roots of 81018

• 81018 squared (81018²) is 6563916324
• 81018 cubed (81018³) is 531795372737832
• The square root of 81018 is 284.6366104351
• The cube root of 81018 is 43.2706918709

Scales and comparisons

• 81,018 seconds is equal to 22 hours, 30 minutes, 18 seconds.
• To count from 1 to 81,018 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 81018 cubic inches would be around 3.6 feet tall.

Recreational maths with 81018

• 81018 is the same when its digits are reversed! That makes it a palindromic number.
• 81018 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 81018's digits is 18
• More coming soon!