There are 9 in all.
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Two factors. 9 and 4 are factors of 36.
The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36.
Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. All of the factors of 36 are also factors of 72.
Since 36 is a factor of 72, all of its factors are included in the factors of 72.
The set of factors of 72 contains the set of factors of 36.