78125

Names of 78125

• Cardinal: 78125 can be written as Seventy-eight thousand, one hundred twenty-five.

Scientific notation

• Scientific notation: 7.8125 × 10⁴

Factors of 78125

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 5

Divisors of 78125

• Number of divisors d(n): 8
• Complete list of divisors:
  1 5 25 125 625 3125 15625 78125
• Sum of all divisors σ(n): 97656
• Sum of proper divisors (its aliquot sum) s(n): 19531
• 78125 is a deficient number, because the sum of its proper divisors (19531) is less than itself. Its deficiency is 58594

Bases of 78125

• Binary: 10011000100101101₂
• Hexadecimal: 0x1312D
• Base-36: 1OA5

Squares and roots of 78125

• 78125 squared (78125²) is 6103515625
• 78125 cubed (78125³) is 476837158203125
• The square root of 78125 is 279.5084971875
• The cube root of 78125 is 42.7493986669

Scales and comparisons

• 78,125 seconds is equal to 21 hours, 42 minutes, 5 seconds.
• To count from 1 to 78,125 would take you about twenty-one 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 78125 cubic inches would be around 3.6 feet tall.

Recreational maths with 78125

• 78125 backwards is 52187
• The number of decimal digits it has is: 5
• The sum of 78125's digits is 23
• More coming soon!