What is the greatest common factor of 16 28 and 36?

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 16, 28, and 36 is 4
The GCF is 4.