1, 2, 4, 7, 8, 14, 28, 56
1, 5, 17, 85
1, 2, 43, 86
1, 89
1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
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28 is a perfect number. Add the factors of the number, excluding the number itself. 28: 1 +2 +4 + 7 + 14 = 28. The sum of its factors is the same as the number! The next perfect numbers are 496, 8128, 33550336, 8589869056, 137438691328, 2305843008139952128, 2658455991569831744654692615953842176, and 191561942608236107294793378084303638130997321548169216. Chances are that you won't be using that!
Factors of 90 will be factors of 180.
factors: 1, 449prime factors: 449
Yes, all the factors of 12 are factors of 24.
Factors: 1,166,2,83 Prime factors: 2, 83