Calculators

Perfect Number Checker

Check if divisors sum to the number.

Whole number

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Verdict

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Sum of proper divisors

Proper divisors

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This free perfect number checker tests whether a number equals the sum of its proper divisors — the divisors excluding the number itself. If the sum equals the number it is perfect (like 6 = 1 + 2 + 3, or 28); if the sum is less it is deficient, and if greater it is abundant. The tool lists every proper divisor, their total and the verdict. Everything runs in your browser.