The only number is 1.
But if you are looking for number that they each go into, the smallest number is 210.
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1, 7, 11, 77.
(11+7+20+2+10)/5 = 50/5 = 10
All prime numbers have only two factors. 2, 3, 5, 7, 11
975
140 = 2 * 2 * 5 * 7 700 = 2 * 2 * 5 * 5 * 7