the greatest common factor is 7
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The greatest common factor of 7 and 28 is 7.
The greatest common factor can't be a smaller number than the least common factor, but if you meant least common multiple, 7 and 28 have a GCF of 7 and an LCM of 28.
21 and 28.
14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
Since 7 is a factor of 28 itself. Therefore the lowest common multiple will be 28.