The factors of the number 6,615,648 are: 1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 19, 24, 26, 27, 31, 32, 36, 38, 39, 48, 52, 54, 57, 62, 72, 76, 78, 93, 96, 104, 108, 114, 117, 124, 144, 152, 156, 171, 186, 208, 216, 228, 234, 247, 248, 279, 288, 304, 312, 342, 351, 372, 403, 416, 432, 456, 468, 494, 496, 513, 558, 589, 608, 624, 684, 702, 741, 744, 806, 837, 864, 912, 936, 988, 992, 1026, 1116, 1178, 1209, 1248, 1368, 1404, 1482, 1488, 1612, 1674, 1767, 1824, 1872, 1976, 2052, 2223, 2232, 2356, 2418, 2736, 2808, 2964, 2976, 3224, 3348, 3534, 3627, 3744, 3952, 4104, 4446, 4464, 4712, 4836, 5301, 5472, 5616, 5928, 6448, 6669, 6696, 7068, 7254, 7657, 7904, 8208, 8892, 8928, 9424, 9672, 10602, 10881, 11232, 11856, 12896, 13338, 13392, 14136, 14508, 15314, 15903, 16416, 17784, 18848, 19344, 21204, 21762, 22971, 23712, 26676, 26784, 28272, 29016, 30628, 31806, 35568, 38688, 42408, 43524, 45942, 53352, 56544, 58032, 61256, 63612, 68913, 71136, 84816, 87048, 91884, 106704, 116064, 122512, 127224, 137826, 169632, 174096, 183768, 206739, 213408, 245024, 254448, 275652, 348192, 367536, 413478, 508896, 551304, 735072, 826956, 1102608, 1653912, 2205216, 3307824, 6615648.
If you add them up, you will get the total of 6,615,663. Now subtract 6,615,648 to get 15,963,552