Ответ:30: 1, 2, 3, 5, 6, 10, 15, 30.12: 1, 2, 3, 4, 6, 12.28: 1, 2, 4, 7, 14, 28.72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.