+The **aliquot sum** of a positive integer is the sum of its [proper divisors](/wiki/proper_divisor), those positive divisors other than the number itself. This intrinsic sum helps classify numbers as [perfect](/wiki/perfect_number), deficient, or abundant, revealing a number's relationship to its own constituent parts.
+## See also
+- [Deficient Number](/wiki/deficient_number)
+- [Abundant Number](/wiki/abundant_number)
+- [Amicable Numbers](/wiki/amicable_numbers)