815

815 is an odd composite number composed of two prime numbers multiplied together.

What does the number 815 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

815 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 815:

5 × 163

See below for interesting mathematical facts about the number 815 from the Numbermatics database.


Names of 815

  • Cardinal: 815 can be written as Eight hundred fifteen.

Scientific notation

  • Scientific notation: 8.15 × 102

Factors of 815

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 168

Divisors of 815

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 984
  • Sum of proper divisors (its aliquot sum) s(n): 169
  • 815 is a deficient number, because the sum of its proper divisors (169) is less than itself. Its deficiency is 646

Bases of 815

  • Binary: 11001011112
  • Hexadecimal: 0x32F
  • Base-36: MN

Squares and roots of 815

  • 815 squared (8152) is 664225
  • 815 cubed (8153) is 541343375
  • The square root of 815 is 28.5482048473
  • The cube root of 815 is 9.3408386343

Scales and comparisons

How big is 815?
  • 815 seconds is equal to 13 minutes, 35 seconds.
  • To count from 1 to 815 would take you about six minutes.

    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 815 cubic inches would be around 0.8 feet tall.

Recreational maths with 815

  • 815 backwards is 518
  • The number of decimal digits it has is: 3
  • The sum of 815's digits is 14
  • More coming soon!

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"Number 815 - Facts about the integer". Numbermatics.com. 2024. Web. 24 July 2024.

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Numbermatics. (2024). Number 815 - Facts about the integer. Retrieved 24 July 2024, from https://numbermatics.com/n/815/

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Numbermatics. 2024. "Number 815 - Facts about the integer". https://numbermatics.com/n/815/

The information we have on file for 815 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

Keywords: Divisors of 815, math, Factors of 815, curriculum, school, college, exams, university, Prime factorization of 815, STEM, science, technology, engineering, physics, economics, calculator, eight hundred fifteen.

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