The number is 1.
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well, no number goes int 5 or 7 that can also go into 8 or 4.
not one number goes into 6 and 7 unless it is 1. the numbers 1, 2, 3, and 6 go into 6. only 1 goes into 7 because 7 is a prime number
21
Just 1.
1 goes into 7 and 5 and 8 and 9 and 6