28
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the greatest common factor is 7
As a common factor, yes.
1, 2, 3, 61, 7
4 is a factor of 28. 4 is a divisor of 28. 7 is a factor of 28. 7 is a divisor of 28. 28 is a multiple of 7. 28 is a multiple of 4. 28 is a product of 4 and 7. 28 is divisible by 4. 28 is divisible by 7.
You can factor out a 7 making it 3 and 4.