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 Interactive Checkpoint
 Perfect Number:  A number in which the sum of all of its proper divisors equals the number itself.

Answer the following questions about perfect numers.

Select the answer for part (a) and enter the answer for part (b) below and press tab to check your result.

Graded Response

 a) Is 144 a perfect number ?  a)
 b) What is the smallest perfect number ?  b)