The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
The greatest common factor of 45, 48, and 72 is 3
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The GCF of 36, 45, and 72 is 9.
The GCF is 9.
The greatest common factor of 7248 , 72 = 24
The greatest factor is 72 which is a factor of 72 (though not of 60).
The GCF is 8.