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| 1638: | 2 | 3 | 3 | 7 | 13 | |
| 2457: | 3 | 3 | 3 | 7 | 13 | |
| GCF: | 3 | 3 | 7 | 13 |
The Greates Common Factor (GCF) is: 3 x 3 x 7 x 13 = 819
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