come si fa 6890 x 4872 ?

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