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You need a second number to have a highest common factor or it is infinite

Q: What is the greatest common factor of number 15?

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15 and 30 is just one pair of number that has a greatest common factor of 15

Since the number 29 is prime, the greatest common factor of 15 and 29 is 1.

The greatest (or highest) common factor is the highest number that divides exactly into two or more numbers. The greatest common factor of 14 and 15 is 1

The greatest factor of any number is the number itself. The greatest common factor of 60 and 75 is 15.

The greatest common factor of 15 and 105 is 15.

The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.

The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.

The greatest common factor for 15 and 16 is 1.

The greatest common factor of 15 and 55 is 5.

The greatest common factor of 15 and 32 is 1

The greatest common factor of 15 and 110 is 5.

3 is the greatest common factor of 69 and 15.