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Number Theory Level 2

which of the following is a perfect number

29 443 7 28

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Dinesh Grover by Dinesh Grover , 20, India

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2 solutions

Mithun Arya
Oct 20, 2014

All the divisors of 28 are - 1,2,4,7,14,28 Perfect no is the no having equal to the sum of its all dividers excluding itself. so 28 = 1+2+4+7+14.. 28 is a perfect number..

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Dido Bodurov
Oct 19, 2014

Perfect number: The sum of all integer dividers of the number except the biggest divider must be equal to the number. In this case: 28 = 1 + 2 + 4 + 7 + 14

2 Helpful 0 Interesting 0 Brilliant 0 Confused

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