Jillian Tica answered The 8 factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The 6 factors of 28 are 1, 2, 4, 7, 14, and 28. The 6 factors of 63 are 1, 3, 7, 9, 21, and 63.