This kind of number is equal to the sum of its positive factors, excluding itself. The first 3 examples are 6, 28, and 496.

Keep practicing — related questions

• The numbers that have only two factors, 1 and the number itself, are called ______.
• The number 12 has 6 factors: 1, 2, 3, 4, 6, and 12. If you add up those factors you will get 28. Because of...
• The number 12 has 6 factors: 1, 2, 3, 4, 6, and 12. If you add up those factors you will get 28. Because of...
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• This kind of number is divisible by only one and itself. The first few examples are 2, 3, 5, 7, and 11.
• This kind of number is divisible by only one and itself. The first few examples are 2, 3, 5, 7, and 11.
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