The factors of the number 1,872,720 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 17, 18, 20, 24, 27, 30, 34, 36, 40, 45, 48, 51, 54, 60, 68, 72, 80, 81, 85, 90, 102, 108, 120, 135, 136, 144, 153, 162, 170, 180, 204, 216, 240, 255, 270, 272, 289, 306, 324, 340, 360, 405, 408, 432, 459, 510, 540, 578, 612, 648, 680, 720, 765, 810, 816, 867, 918, 1020, 1080, 1156, 1224, 1296, 1360, 1377, 1445, 1530, 1620, 1734, 1836, 2040, 2160, 2295, 2312, 2448, 2601, 2754, 2890, 3060, 3240, 3468, 3672, 4080, 4335, 4590, 4624, 5202, 5508, 5780, 6120, 6480, 6885, 6936, 7344, 7803, 8670, 9180, 10404, 11016, 11560, 12240, 13005, 13770, 13872, 15606, 17340, 18360, 20808, 22032, 23120, 23409, 26010, 27540, 31212, 34680, 36720, 39015, 41616, 46818, 52020, 55080, 62424, 69360, 78030, 93636, 104040, 110160, 117045, 124848, 156060, 187272, 208080, 234090, 312120, 374544, 468180, 624240, 936360, 1872720.
If you add them up, you will get the total of 6,909,342.