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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7The highest common factor is 7
The highest common factor for 18 and 16 is 2.
HCF stands for Highest Common Factor. It is also known as the GCF, or Greatest Common Factor.
The highest or greatest common factor of 420 and 294 is 42.
obviously, its highest common factor is the number itself. so the answer here is 90.