The factors of the number 87,236,028 are: 1, 2, 3, 4, 6, 9, 11, 12, 18, 22, 27, 33, 36, 41, 44, 54, 66, 81, 82, 99, 108, 123, 132, 162, 164, 198, 199, 243, 246, 297, 324, 369, 396, 398, 451, 486, 492, 594, 597, 738, 796, 891, 902, 972, 1107, 1188, 1194, 1353, 1476, 1782, 1791, 1804, 2189, 2214, 2388, 2673, 2706, 3321, 3564, 3582, 4059, 4378, 4428, 5346, 5373, 5412, 6567, 6642, 7164, 8118, 8159, 8756, 9963, 10692, 10746, 12177, 13134, 13284, 16119, 16236, 16318, 19701, 19926, 21492, 24354, 24477, 26268, 32238, 32636, 36531, 39402, 39852, 48357, 48708, 48954, 59103, 64476, 73062, 73431, 78804, 89749, 96714, 97908, 109593, 118206, 146124, 146862, 177309, 179498, 193428, 219186, 220293, 236412, 269247, 293724, 354618, 358996, 438372, 440586, 531927, 538494, 660879, 709236, 807741, 881172, 1063854, 1076988, 1321758, 1615482, 1982637, 2127708, 2423223, 2643516, 3230964, 3965274, 4846446, 7269669, 7930548, 9692892, 14539338, 21809007, 29078676, 43618014, 87236028.
If you add them up, you will get the total of 256,838,400.