The greatest divisor is the largest number that divides into a given number evenly - no remainder or fractions. For example, the greatest divisor of 75 is 25 since no number greater than 25 will go into 75 evenly.
By GCF you mean Greatest Common Divisor = 72
Greatest divisor of 25 and 40 is 5.
The greatest common divisor is 45.
The Greatest Common Divisor is 10
The Greatest Common Divisor is 4
The Greatest Common Divisor is 35
The Greatest Common Divisor is 28
The Greatest Common Divisor is 1
The Greatest Common Divisor is 19
The Greatest Common Divisor is 2
The Greatest Common Divisor is 4
The Greatest Common Divisor is 22