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teachoo.com
Perfect number - Definition, First 10 perfect numbers - Teachoo
If Sum of all factors is equal to twice the number,then number is called a perfect numberFor 6Factors of 6 are 1, 2, 3, 6Sum of factors = 1 + 2 + 3 + 6 = 12Since 12 = 2 × 6∴ Sum of factors is equal to twice the numberSo, 6 is a perfect numberFor 28Factors of 28 are 1, 2, 4, 7, 14, 28Sum of factors =
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