2 * 2 * 2 * 2 * 2 * 2 * 2, or 27.
Broken down as follows.....
128
2, 64
2, 2, 32
2, 2, 2, 16
2, 2, 2, 2, 8
2, 2, 2, 2, 2, 4
2, 2, 2, 2, 2, 2, 2
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Since 16 is a factor of 128, it is automatically the GCF.
128 and 98 have no common factor except ' 1 '.
16 cause the highest factor for both 128 and 640
-120
The GCF is 32.