The greatest common factor for 7 and 28 = 7.
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28 is the LCM of 4 and 7 , the smallest number divisible by both.
The greatest common factor for 7 and 28 is 7
The greatest, and only, common factor of 57 (=3x19) and 28 (=22x7) is 1.
Greatest Common Divisor (GCD) for 20 28 is 4.
The Greatest Common Factor of 28, 42, 63: 7