5
They are 1,2,4,7,14, and 28
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The factors of 16 are 1, 2, 4, 8, and 16 The factors of 28 are 1, 2, 4, 7, 14, and 28
Factors of 28: 1, 2, 4, 7, 14, and 28 .
No since it is an even number it has 2 as a factor. If the factors are the number itself and 1 it is prime. If there are more factors it is not. 28 has many more factors.28=22 x7So 2 and 4 and 7 are all factors as is 14.
The factors of 28 are: 1, 2, 4, 7, 14, 28.
The factors of 18 are: 1, 2, 3, 6, 9, 18.The factors of 28 are: 1, 2, 4, 7, 14, 28.The factors of 34 are: 1, 2, 17, 34.The common factors are: 1, 2