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Let us list the factors of 28.
28 = 2*2*7 = 4 * 7.
4 + 7 = 11
The two factors are 4 and 7.
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4 and 7
4 and 2 are factors of -28.
4 & 7
28 and 45 do.
5 + 23 = 28 11 + 17 = 28
28 = 2 x 2 x 7 2 + 2 + 7 = 11
The prime factors of 28 are 2 and 7. Their sum is 9.
28 and 39.
17 AND 11
28