The HCF of 686 is 686. But it's a factor as opposed to a common factor because there's only one number.
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It is: 686*50 = 34,300
1, 2, 7, 14, 49, 98, 343, 686
1, 2, 7, 14, 49, 98, 343, 686.
686 = 2 * 7 * 7 * 7 = 2 * 73
2 x 7 x 7 x 7 = 686