The factors of the number 8,857,728 are: 1, 2, 3, 4, 6, 8, 9, 11, 12, 16, 18, 22, 24, 27, 32, 33, 36, 44, 48, 54, 64, 66, 72, 88, 96, 99, 108, 128, 132, 144, 176, 192, 198, 216, 233, 264, 288, 297, 352, 384, 396, 432, 466, 528, 576, 594, 699, 704, 792, 864, 932, 1056, 1152, 1188, 1398, 1408, 1584, 1728, 1864, 2097, 2112, 2376, 2563, 2796, 3168, 3456, 3728, 4194, 4224, 4752, 5126, 5592, 6291, 6336, 7456, 7689, 8388, 9504, 10252, 11184, 12582, 12672, 14912, 15378, 16776, 19008, 20504, 22368, 23067, 25164, 29824, 30756, 33552, 38016, 41008, 44736, 46134, 50328, 61512, 67104, 69201, 82016, 89472, 92268, 100656, 123024, 134208, 138402, 164032, 184536, 201312, 246048, 268416, 276804, 328064, 369072, 402624, 492096, 553608, 738144, 805248, 984192, 1107216, 1476288, 2214432, 2952576, 4428864, 8857728.
If you add them up, you will get the total of 28,641,600.