+A **perfect number** is a positive integer that is equal to the sum of its [proper divisors](/wiki/proper_divisor) (divisors excluding the number itself). These rare numbers, like 6 and 28, are intimately tied to [Mersenne primes](/wiki/Mersenne_prime) and have fascinated mathematicians for millennia.
+## See also
+- [Prime Number](/wiki/prime_number)
+- [Divisor](/wiki/divisor)
+- [Number Theory](/wiki/number_theory)
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