9 is not prime, so it is not a prime factor of 72, great or otherwise.
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The GCF of 36, 45, and 72 is 9.
GCF(72, 27) = 9
9
Alright, buckle up buttercup. The greatest common factor of 63, 81, and 72 is 9. That's right, 9 is the big winner here. So, next time you're staring at a bunch of numbers, just remember that good ol' 9 is there to save the day.
The GCF is 9.