A single number cannot have a greatest common divisor because "common" refers to factors that two or more numbers have in common. You have only one.
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The Greatest Common Divisor of 56, 84 is 28.
The GCF is 2.
Greatest Common Divisor (GCD) for 105 56 is 7.
It is: 7
Greatest Common Divisor (GCD) for 24 56 72 is 8.