come si fa 687 x 349326 ?

7 8 6 6 2 3 9 4 3 x = 2 4 2 5 1 4 4 1 7 1 3 1 1 2 6 2 0 2 3 6 8 7 1 6 8 2 4 3 7 2 1 2 6 2 0 2 1 1 1 2 6 9 6 8 9 9 3 2
x