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

305 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 305:

5 × 61

See below for interesting mathematical facts about the number 305 from the Numbermatics database.

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Names Factors Divisors Scales Roots Fun

Names of 305

  • Cardinal: 305 can be written as Three hundred five.

Scientific notation

  • Scientific notation: 3.05 × 102

Factors of 305

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 66

Divisors of 305

  • Number of divisors d(n): 4
  • Complete list of divisors:
    1 5 61 305
  • Sum of all divisors σ(n): 372
  • Sum of proper divisors (its aliquot sum) s(n): 67
  • 305 is a deficient number, because the sum of its proper divisors (67) is less than itself. Its deficiency is 238

Bases of 305

  • Binary: 100110001 2
  • Hexadecimal: 0x131

Squares and roots of 305

  • 305 squared (3052) is 93025
  • 305 cubed (3053) is 28372625
  • The square root of 305 is 17.4642491965
  • The cube root of 305 is 6.7313154973

Scales and comparisons

How big is 305?
  • 305 seconds is equal to 5 minutes, 5 seconds.
  • To count from 1 to 305 would take you about two 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.

    Note: we do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!

  • A cube with a volume of 305 cubic inches would be around 0.6 feet tall.

Recreational maths with 305

  • 305 backwards is 503
  • The number of decimal digits it has is: 3
  • The sum of 305's digits is 8
  • More coming soon!

The information we have on file for 305 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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