The factors of the number 1,350,888 are: 1, 2, 3, 4, 6, 7, 8, 11, 12, 14, 17, 21, 22, 24, 28, 33, 34, 42, 43, 44, 51, 56, 66, 68, 77, 84, 86, 88, 102, 119, 129, 132, 136, 154, 168, 172, 187, 204, 231, 238, 258, 264, 301, 308, 344, 357, 374, 408, 462, 473, 476, 516, 561, 602, 616, 714, 731, 748, 903, 924, 946, 952, 1032, 1122, 1204, 1309, 1419, 1428, 1462, 1496, 1806, 1848, 1892, 2193, 2244, 2408, 2618, 2838, 2856, 2924, 3311, 3612, 3784, 3927, 4386, 4488, 5117, 5236, 5676, 5848, 6622, 7224, 7854, 8041, 8772, 9933, 10234, 10472, 11352, 13244, 15351, 15708, 16082, 17544, 19866, 20468, 24123, 26488, 30702, 31416, 32164, 39732, 40936, 48246, 56287, 61404, 64328, 79464, 96492, 112574, 122808, 168861, 192984, 225148, 337722, 450296, 675444, 1350888.
If you add them up, you will get the total of 4,561,920.