GCF for 2, 5 and 7

"Greatest Common Factor of 3 Numbers" Calculator
Greatest Common Factor of
,
and

What's the Greatest Common Factor (GCF) of 2, 5 and 7?

Answer

GCF of 2, 5 and 7 is
1

Common factors: 1

Only 1 divides all three: no prime is a factor of each of 2, 5 and 7.

The three numbers are pairwise coprime: no two of them share a factor other than 1.

2 — prime

5 — prime

7 — prime

Prime257Lowest power
22———
5—5——
7——7—

— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

GCF = 1

More with these numbers

Related Calculations

See Also

GCF Table

1st2nd3rdGCF
1251
2251
2351
2451
2551
2561
2571
2581
2591
25101
25111
25121
25131
25141
25151
25161
25171
25181
25191
25201
25211
25221
25231
25241
25251
25261
25271
25281
25291
25301

FAQ

What's the Greatest Common Factor (GCF) of 2, 5 and 7?

GCF of 2, 5 and 7 is 1

What prime factors do 2, 5 and 7 share?

None at all: 2, 5 and 7 have no prime factor in common, so the only positive integer dividing all three is 1 and their GCF is 1.

Can you get the GCF of 2, 5 and 7 two numbers at a time?

Yes. The GCF of 2 and 5 is 1, and the GCF of 1 and 7 is 1 — the same answer, because the greatest common factor is associative and does not depend on the order of the three numbers.

How does the GCF simplify the ratio 2 : 5 : 7?

Divide every term by the GCF 1: 2 ÷ 1 = 2, 5 ÷ 1 = 5 and 7 ÷ 1 = 7. So 2 : 5 : 7 in lowest terms is 2 : 5 : 7, and no whole number other than 1 divides all three of those.

See Also