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abundant n.  and  nonagonal n.

First numbers that belong to both sets:

24, 204, 396, 474, 750, 1216, 1350, 1794, 1956, 2484, 3504, 4200, 4446, 5226, 5500, 6666, 7614, 7944, 8976, 10450, 10836, 12036, 12450, 13734, 16014, 17466, 17964, 19500, 22200, 23904, 24486, 26274, 26884, 28756, 29394, 31350, 32016, 34056, 37596, 39804, 40554, 42075, 42846, 43624, 46000, 46806, 49266, 50100, 52644, 57024, 59736, 60654, 63450, 68250, 71214, 72216, 75264, 80484, 83700, 84786, 88086, 89200, 93726, 97194, 98364, 101916, 106750, 107976, 111696, 112950, 116754, 121924, 123234, 127206, 128544, 132600, 139500, 143724, 145146, 149454, 150904, 155296, 156774, 161250, 162756, 167316, 168850, 175056, 179784, 181374, 186186, 192700, 194346, 199326, 201000, 206064, 209475, 214644, 219876, 221634, 226950, 234136, 235950, 241434, 243276, 248844, 254475, 258264, 264000, 265926, 271746, 273700, 281586, 287574, 289584, 295656, 305916, 312156, 314250, 320574, 322696, 331254, 337746, 339924, 346500, 357600, 364344, 366606, 373434, 384954, 391950, 394296, 401376, 403750, 413316, 420564, 422994, 430326, 432784, 440200, 442686, 450186, 452700, 460284, 473064, 480816, 483414, 491250, 504450, 512454, 515136, 523224, 536844, 545100, 547866, 556206, 559000, 567424, 570246, 578754, 581604, 590196, 604656, 613416, 616350, 625194, 631125, 637084, 640074, 649086, 652104, 661200, 676500, 685764, 688866, 698214, 701344, 710776, 713934, 723450, 726636, 736236, 752376, 762144, 765414, 775266, 788500, 791826, 801846, 805200, 815304, 832284, 842556, 845994, 856350, 873750, 884274, 887796, 898404, 916224, 927000, 930606, 941466, 945100, 959706, 970734, 974424, 985536, 1000450, 1004196, 1015476, 1019250, 1030614, 1034416, 1049694, 1061226, 1065084, 1076700, 1096200, 1107984, 1111926, 1123794, 1127764, 1143714, 1155750, 1159776, 1171896, 1192236, 1204524, 1208634, 1221006, 1237600, 1241766, 1254306, 1258500, 1271124, 1279575, 1292304, 1305096, 1309374, 1322250, 1326556, 1343850, 1356894, 1361256, 1374384, 1387575, 1396404, 1409700, 1414146, 1427526, 1432000, 1449966, 1463514, 1468044, 1481676, 1504536, 1518336, 1522950, 1536834, 1546125, 1555444, 1560114, 1574166, 1578864, 1593000, 1616700, 1631004, 1635786, 1650174, 1654984, 1674294, 1688850, 1693716, 1708356, 1713250, 1732896, 1747704, 1752654, 1767546.

Some larger examples :