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The only common factor of 49 and 64 (whole number that goes into both of them evenly) is ' 1 '.
2 is a number which goes into both.
The HCF of both numbers is 16
1. The numbers are co-prime
27 is 3 to the 3rd power, and 64 is 2 to the 6th power, so the only number that goes into both evenly is one (1).