The World Today - Comment
**Question 464: What is a perfect number?**
*Author: ShiplordAtvar - Category: Science* Difficulty: 5/5 - Zone: World
A number such that the sum of its factors, excluding itself, is greater than itself A number such that its only divisors are 1 and itself
**A number such that the sum of its factors, excluding itself, equals itself** A number such that it cannot be expressed as the ratio of two integers
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