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2 x 2 x 7
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The prime factorization is: 22 x 7
The prime factorization of 28 is: 2 x 2 x 7
28 = 22 x 71
28 = 2 times 2 times 7
28 = 2 * 2 * 7 = 22 * 742 = 2 * 3 * 7