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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Highest common factor of 273 and 315 is 21.
21
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.