649

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

What does the number 649 look like?

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

649 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 649:

11 × 59

See below for interesting mathematical facts about the number 649 from the Numbermatics database.


Names of 649

  • Cardinal: 649 can be written as Six hundred forty-nine.

Scientific notation

  • Scientific notation: 6.49 × 102

Factors of 649

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 70

Divisors of 649

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 720
  • Sum of proper divisors (its aliquot sum) s(n): 71
  • 649 is a deficient number, because the sum of its proper divisors (71) is less than itself. Its deficiency is 578

Bases of 649

  • Binary: 10100010012
  • Hexadecimal: 0x289
  • Base-36: I1

Squares and roots of 649

  • 649 squared (6492) is 421201
  • 649 cubed (6493) is 273359449
  • The square root of 649 is 25.4754784057
  • The cube root of 649 is 8.6579465215

Scales and comparisons

How big is 649?
  • 649 seconds is equal to 10 minutes, 49 seconds.
  • To count from 1 to 649 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 649 cubic inches would be around 0.7 feet tall.

Recreational maths with 649

  • 649 backwards is 946
  • The number of decimal digits it has is: 3
  • The sum of 649's digits is 19
  • More coming soon!

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The information we have on file for 649 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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