Q: What is the sum of all factors of the number 78,400 excluding 78,400?

A: 146,009

Why is 146,009 the sum of all factors of 78,400, excluding 78,400?

The factors of the number 78,400 are: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 32, 35, 40, 49, 50, 56, 64, 70, 80, 98, 100, 112, 140, 160, 175, 196, 200, 224, 245, 280, 320, 350, 392, 400, 448, 490, 560, 700, 784, 800, 980, 1120, 1225, 1400, 1568, 1600, 1960, 2240, 2450, 2800, 3136, 3920, 4900, 5600, 7840, 9800, 11200, 15680, 19600, 39200, 78400.

If you add them up, you will get the total of 78,546. Now subtract 78,400 to get 146,009