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7777 + 777*4 + 7*22 + 77 - 7 + 2 = 11111
0123469
The least prime number is 2.
By rearranging the digits the answer is 123.
1 is the least common factor of the number 2, number 4 and number 7. 28 is the least common multiple of the number 2, number 4 and 7.