81015

Names of 81015

• Cardinal: 81015 can be written as Eighty-one thousand and fifteen.

Scientific notation

• Scientific notation: 8.1015 × 10⁴

Factors of 81015

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 510

Divisors of 81015

• Number of divisors d(n): 16
• Complete list of divisors:
  1 3 5 11 15 33 55 165 491 1473 2455 5401 7365 16203 27005 81015
• Sum of all divisors σ(n): 141696
• Sum of proper divisors (its aliquot sum) s(n): 60681
• 81015 is a deficient number, because the sum of its proper divisors (60681) is less than itself. Its deficiency is 20334

Bases of 81015

• Binary: 10011110001110111₂
• Hexadecimal: 0x13C77
• Base-36: 1QIF

Squares and roots of 81015

• 81015 squared (81015²) is 6563430225
• 81015 cubed (81015³) is 531736299678375
• The square root of 81015 is 284.6313405089
• The cube root of 81015 is 43.2701577767

Scales and comparisons

• 81,015 seconds is equal to 22 hours, 30 minutes, 15 seconds.
• To count from 1 to 81,015 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 81015 cubic inches would be around 3.6 feet tall.

Recreational maths with 81015

• 81015 backwards is 51018
• 81015 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 81015's digits is 15
• More coming soon!