The GCD of given numbers is 4.
factors of 36 are : | 1 , 2 , 3 , 4 , 6 , 9 , 12 , 18 , 36 |
factors of 72 are : | 1 , 2 , 3 , 4 , 6 , 8 , 9 , 12 , 18 , 24 , 36 , 72 |
factors of 144 are : | 1 , 2 , 3 , 4 , 6 , 8 , 9 , 12 , 16 , 18 , 24 , 36 , 48 , 72 , 144 |
factors of 164 are : | 1 , 2 , 4 , 41 , 82 , 164 |
We see that the Greatest Common Factor = 4.