Short answer: There are none.
There is not a greatest common factor of a single number, such as 36, because there cannot be a greatest common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common.
The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36.
Examples:
The common factors of 27 and 36 are 1, 3, and 9; the greatest common factor is 9.
The common factors of 36 and 44 are 1, 2, and 4; the greatest common factor is 4.
The common factors of 12, 36, and 78 are 1, 2, 3, and 6; the greatest common factor is 6.
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