Question 139

Fill in the blank to make the statement true.

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

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Solution

Perfect
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.
Examples:
(i) 6 (smallest perfect number) = 1+ 2+ 3
(ii) 28 = 1+2+3+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.

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

Question 136

Fill in the blank to make the statement true.

A number is a ............. of each of its factors.

A number for which sum all its factors is equal to twice number is called ?

Question 138

Fill in the blank to make the statement true.

The number of factors of a prime number is...........

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