Problem 2544. Determine if given number is perfect

sunny d

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A number is perfect if it is equal to the sum of its factors, excluding itself.
Example
The number 6 is perfect since its factors (other than 6) are 1, 2, and 3.
 1 + 2 + 3 = 6
Return 1 for true (perfect), otherwise 0.

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Last Solution submitted on May 28, 2026

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Guillaume on 3 Sep 2014

Could you improve your test suite with more test cases? (e.g. 496, 28 (true) and 26, 500 (false))

Ned Gulley on 4 Sep 2014

I added some more tests.

Jean-Marie Sainthillier on 6 Sep 2014

See problem 1012.

J.R.! Menzinger on 16 Sep 2014

The point "the sum of its factors" is not correct. it must be "the sum of all his divisors"... :-/

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