It is not possible to give a sensible answer to this question. The highest common factor (HCF) 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 highest common factor of 36 and 72 is 36
The greatest common factor of 39, 42, and 72 is 3
The highest common factor of the numbers 30, 60 and 72 is 6.
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The GCF of 72 and 120 is 24.