Answer :
The answer is one.
Factors for 74: 1, 2, 37, and 74
Factors for 69: 1, 3, 23, and 69
Factors for 81: 1, 3, 9, 27, and 81
Factors for 74: 1, 2, 37, and 74
Factors for 69: 1, 3, 23, and 69
Factors for 81: 1, 3, 9, 27, and 81