There are 3 factor pairs of 28.
28 = 1 x 28
28 = 2 x 14
28 = 4 x 7
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1, 28 2, 14 4, 7
1, 2, 4, 7, 14, 28 (28,1)(14,2)(7,4)
Factor pairs of 84 are: 2 x 42, 3 x 28, 4 x 21, 6 x 84, 7 x 12
The factor pairs of 91 are (1,91) and (7,13).
30 has four factor pairs:30,115,210,36,5