How about: 45
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There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
The greatest common factor of 54 , 90 = 18
The greatest common factor of 1925 , 90 = 5
The greatest common factor of 24 , 90 = 6
The greatest common factor of 90 and 39 is 3