Question

why is 28 a perfect number?​

Answer 1

Step-by-step explanation:

factors of 28 are

1, 2, 4, 7, 14, 28

sum of all factors of 28= 1 + 2 + 4, + 7, + 14 + 28

=56

= 2×28

= two times of the number

sum of all factors of a number is equal to twice of the number then it is perfect number

so 28 is a perfect number.

Answer 2

Answer:

Except adding 28 if you add all the factors of 28 then , you will get 28 itself.

Factors of 28 = 1 , 2 , 4 , 7 , 14.

If you add all these given above factors of 28 then , you will get 28 itself.

Sum of all the given above factors of 28 = 1 + 2 + 4 + 7 + 14 = 28.

So , 28 is equal to 28 ( or ) 28 = 28.

Therefore , 28 is a perfect number.

I hope it helps you.