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

What does the number 687 look like?

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

687 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 687:

3 × 229

See below for interesting mathematical facts about the number 687 from the Numbermatics database.

Names of 687

  • Cardinal: 687 can be written as Six hundred eighty-seven.

Scientific notation

  • Scientific notation: 6.87 × 102

Factors of 687

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 232

Divisors of 687

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 920
  • Sum of proper divisors (its aliquot sum) s(n): 233
  • 687 is a deficient number, because the sum of its proper divisors (233) is less than itself. Its deficiency is 454

Bases of 687

  • Binary: 10101011112
  • Hexadecimal: 0x2AF
  • Base-36: J3

Squares and roots of 687

  • 687 squared (6872) is 471969
  • 687 cubed (6873) is 324242703
  • The square root of 687 is 26.2106848441
  • The cube root of 687 is 8.8237307143

Scales and comparisons

How big is 687?
  • 687 seconds is equal to 11 minutes, 27 seconds.
  • To count from 1 to 687 would take you about five 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 687 cubic inches would be around 0.7 feet tall.

Recreational maths with 687

  • 687 backwards is 786
  • The number of decimal digits it has is: 3
  • The sum of 687's digits is 21
  • More coming soon!

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"Number 687 - Facts about the integer". Numbermatics.com. 2024. Web. 24 May 2024.

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Numbermatics. (2024). Number 687 - Facts about the integer. Retrieved 24 May 2024, from https://numbermatics.com/n/687/

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The information we have on file for 687 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 687, math, Factors of 687, curriculum, school, college, exams, university, Prime factorization of 687, STEM, science, technology, engineering, physics, economics, calculator, six hundred eighty-seven.

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