81388

Names of 81388

• Cardinal: 81388 can be written as Eighty-one thousand, three hundred eighty-eight.

Scientific notation

• Scientific notation: 8.1388 × 10⁴

Factors of 81388

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 20349

Divisors of 81388

• Number of divisors d(n): 6
• Complete list of divisors:
  1 2 4 20347 40694 81388
• Sum of all divisors σ(n): 142436
• Sum of proper divisors (its aliquot sum) s(n): 61048
• 81388 is a deficient number, because the sum of its proper divisors (61048) is less than itself. Its deficiency is 20340

Bases of 81388

• Binary: 10011110111101100₂
• Hexadecimal: 0x13DEC
• Base-36: 1QSS

Squares and roots of 81388

• 81388 squared (81388²) is 6624006544
• 81388 cubed (81388³) is 539114644603072
• The square root of 81388 is 285.2858215895
• The cube root of 81388 is 43.3364626275

Scales and comparisons

• 81,388 seconds is equal to 22 hours, 36 minutes, 28 seconds.
• To count from 1 to 81,388 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 81388 cubic inches would be around 3.6 feet tall.

Recreational maths with 81388

• 81388 backwards is 88318
• The number of decimal digits it has is: 5
• The sum of 81388's digits is 28
• More coming soon!