What are the common factors of 72 84 132?

The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.

The factors of 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.

The factors of 132 are: 1, 2, 3, 4, 6, 11, 12, 22, 33, 44, 66, 132.

The common factors are: 1, 2, 3, 4, 6, 12.