Is 28 a perfect no ?

We call a number perfect if it is the sum of all its positive divisors, except itself. e.g. 28 is a perfect number because 28=1+2+4+7+14 . Which of the following numbers is a perfect number?

Which of the following numbers is a perfect number? 16 (b) 8 (c) 24 (d) 28

Which of the following numbers is a perfect number? 12 (b) 28(c)8 (d) 16

Is 243 a perfect cube?

What is the least number which, when multiplied by 28, forms a perfect square ?

cube root of a perfect even cube is ___________and the perfect odd cube is ______________

An ideal gas or a perfect gas is that ………………….the such as …………………….