81428

Names of 81428

• Cardinal: 81428 can be written as Eighty-one thousand, four hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1428 × 10⁴

Factors of 81428

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 20359

Divisors of 81428

• Number of divisors d(n): 6
• Complete list of divisors:
  1 2 4 20357 40714 81428
• Sum of all divisors σ(n): 142506
• Sum of proper divisors (its aliquot sum) s(n): 61078
• 81428 is a deficient number, because the sum of its proper divisors (61078) is less than itself. Its deficiency is 20350

Bases of 81428

• Binary: 10011111000010100₂
• Hexadecimal: 0x13E14
• Base-36: 1QTW

Squares and roots of 81428

• 81428 squared (81428²) is 6630519184
• 81428 cubed (81428³) is 539909916114752
• The square root of 81428 is 285.3559181089
• The cube root of 81428 is 43.3435610311

Scales and comparisons

• 81,428 seconds is equal to 22 hours, 37 minutes, 8 seconds.
• To count from 1 to 81,428 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 81428 cubic inches would be around 3.6 feet tall.

Recreational maths with 81428

• 81428 backwards is 82418
• The number of decimal digits it has is: 5
• The sum of 81428's digits is 23
• More coming soon!