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The factors of 648 are:

1 2 3 4 6 8 9 12 18 24 27 36 54 7281 108 162 216 324 648

The factors of 720 are:

1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 36 40 45 48 60 72 80 90 120 144 180 240 360 720

We can see from list list that the greatest common factor is 72

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Q: What is the greatest common factor of 720 and 648?
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