Q: What is the sum of all factors of the number 77,880 excluding 77,880?

A: 181,320

Why is 181,320 the sum of all factors of 77,880, excluding 77,880?

The factors of the number 77,880 are: 1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 15, 20, 22, 24, 30, 33, 40, 44, 55, 59, 60, 66, 88, 110, 118, 120, 132, 165, 177, 220, 236, 264, 295, 330, 354, 440, 472, 590, 649, 660, 708, 885, 1180, 1298, 1320, 1416, 1770, 1947, 2360, 2596, 3245, 3540, 3894, 5192, 6490, 7080, 7788, 9735, 12980, 15576, 19470, 25960, 38940, 77880.

If you add them up, you will get the total of 78,061. Now subtract 77,880 to get 181,320