643 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 643 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

643 is a prime number. Like all primes (except two), it is an odd number.

Prime factorization of 643:


See below for interesting mathematical facts about the number 643 from the Numbermatics database.

Names of 643

  • Cardinal: 643 can be written as Six hundred forty-three.

Scientific notation

  • Scientific notation: 6.43 × 102

Factors of 643

  • Number of distinct prime factors ω(n): 1
  • Total number of prime factors Ω(n): 1
  • Sum of prime factors: 643

Divisors of 643

  • Number of divisors d(n): 2
  • Complete list of divisors:
    1 643
  • Sum of all divisors σ(n): 644
  • Sum of proper divisors (its aliquot sum) s(n): 1
  • 643 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 642

Bases of 643

  • Binary: 10100000112
  • Hexadecimal: 0x283
  • Base-36: HV

Squares and roots of 643

  • 643 squared (6432) is 413449
  • 643 cubed (6433) is 265847707
  • The square root of 643 is 25.3574446661
  • The cube root of 643 is 8.6311829921

Scales and comparisons

How big is 643?
  • 643 seconds is equal to 10 minutes, 43 seconds.
  • To count from 1 to 643 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 643 cubic inches would be around 0.7 feet tall.

Recreational maths with 643

  • 643 backwards is 346
  • The number of decimal digits it has is: 3
  • The sum of 643's digits is 13
  • More coming soon!

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The information we have on file for 643 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!

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