It is not possible to give a sensible answer to this question. The common factor refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
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The common factors of 72 and 81 are: 1, 3, and 9
81 and 169 share no common factors aside from 1.
The common factors of 81 and 108 are: 1, 3, 9, and 27
The common factors of 18 and 81 are; 1, 3, and 9. The factors of 18 are; 1, 2, 3, 6, 9, and 18. The factors of 81 are 1, 3, 9, 27, and 81.
The factors of 81 are 1, 3, 9, 27, and 81. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The common factors of 81 and 36 are 1, 3, and 9.