The factors of the number 77,744,640 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 53, 60, 64, 80, 96, 106, 120, 128, 159, 160, 191, 192, 212, 240, 256, 265, 318, 320, 382, 384, 424, 480, 512, 530, 573, 636, 640, 764, 768, 795, 848, 955, 960, 1060, 1146, 1272, 1280, 1528, 1536, 1590, 1696, 1910, 1920, 2120, 2292, 2544, 2560, 2865, 3056, 3180, 3392, 3820, 3840, 4240, 4584, 5088, 5730, 6112, 6360, 6784, 7640, 7680, 8480, 9168, 10123, 10176, 11460, 12224, 12720, 13568, 15280, 16960, 18336, 20246, 20352, 22920, 24448, 25440, 27136, 30369, 30560, 33920, 36672, 40492, 40704, 45840, 48896, 50615, 50880, 60738, 61120, 67840, 73344, 80984, 81408, 91680, 97792, 101230, 101760, 121476, 122240, 135680, 146688, 151845, 161968, 183360, 202460, 203520, 242952, 244480, 293376, 303690, 323936, 366720, 404920, 407040, 485904, 488960, 607380, 647872, 733440, 809840, 971808, 1214760, 1295744, 1466880, 1619680, 1943616, 2429520, 2591488, 3239360, 3887232, 4859040, 5182976, 6478720, 7774464, 9718080, 12957440, 15548928, 19436160, 25914880, 38872320, 77744640.
If you add them up, you will get the total of 254,555,136.