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Perfect Number Checker

Check if a number is perfect.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator checks whether a number is perfect — equal to the sum of its own proper divisors, like 6 (1+2+3) or 28 (1+2+4+7+14) — and if not, whether it's abundant (divisors sum to more than the number) or deficient (divisors sum to less).

Perfect numbers have fascinated mathematicians since Euclid, and this tool is used by math students and hobbyists exploring number theory, since every known even perfect number is tied to a Mersenne prime. Enter any whole number to see its divisor sum and classification.

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