A number equal to the sum of all its factors(except itself) is called a perfect number, e.g., $6$ is a perfect number, since $6 = 1 + 2 + 3$ . There is one more number less than $100$ is perfect. Find it.

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Solution

Number is $28$
As, $28 = 1 + 2 + 4 + 7 + 14$

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In the answer of Question Number 139 it is written -

By definition, a number, for which the sum of all its factors excluding the number itself is equal to twice the number, is called perfect number.

Should it be as below -

a number, for which the sum of all its factors excluding the number itself is equal to the number, is called perfect number.

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A perfect number is a number for which the sum of all its factors is equal to twice the number.

in the above chapter (3), you have mentioned that there are only 2 perfect numbers between 1 and 30 i.e. 6 and 28.

is 24 not a perfect number??

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