Q: What is the sum of all factors of the number 1,440 excluding 1,440?

 A: 3,474

Why is 3,474 the sum of all factors of 1,440, excluding 1,440?

The factors of the number 1,440 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 45, 48, 60, 72, 80, 90, 96, 120, 144, 160, 180, 240, 288, 360, 480, 720, 1440.

If you add them up, you will get the total of 1,443. Now subtract 1,440 to get 3,474


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