Their only common factor is ' 1 '.
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45 and 28 have no common factor. In other words, you can't simplify that.
There is no common factor
The greatest, and only, common factor of 57 (=3x19) and 28 (=22x7) is 1.
The Greatest Common Factor of 36, 45, 54: 9
Least common factor is 1, 2, 14.