Is 645 an abundant number and what is its abundance?

Is 645 an abundant number?

Here we will explain and calculate if 645 is an abundant number and its abundance if applicable.

645 is an abundant number if the sum of its proper divisors is greater than 645.

The sum of its proper divisors is calculated as follows: 1 + 3 + 5 + 15 + 43 + 129 + 215 = 411.

411 is not greater than 645. Therefore, 645 is not an abundant number.

The abundance of 645 is the sum of its proper divisors minus 645. Thus, the abundance of 645 is 411 - 645 = no abundance

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