Q: What is the sum of all factors of the number 978,255 excluding 978,255?

Why is 717,465 the sum of all factors of 978,255, excluding 978,255?

The factors of the number 978,255 are: 1, 3, 5, 9, 15, 45, 21739, 65217, 108695, 195651, 326085, 978255.

If you add them up, you will get the total of 978,972. Now subtract 978,255 to get 717,465

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