The divisors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.
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645 X 73 use LONG MULTIPLICATION. 645 x 73 45150 ( 70 X 645) ( multiply by '7' and then put as '0' on the end). +1935 ( 3 x 645) 47058 ===== The answer.
The divisors of 66 are 1,2,3,6,11,22,33 and 66.
The divisors of 79 are: 1, 79.
The divisors of 23 are: 1, 23.
Sum of divisors: 1,392.