Even + Even = 

Odd x Odd = 

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

General form of a perfect number is

The natural number having exactly two different factors namely 1 and itself, are known as 

Which of the following numbers are divisible by 10?

If the three-digit number 6 $\times \backslash times$ 8 is divisible by 9, then what is the value of x?

Which one of the following numbers is divisible by 3?

The sum of the prime numbers between 60 and 75 is

The least prime number with consecutive digits is