No problem, we've got 6439 and 1201 to multiply
6439 × 1201 = 1201 × (6439)
+ 1201 × 9 that is equal 10809
+ 1201 × 30 yielding 36030
+ 1201 × 400 what gives us 480400
+ 1201 × 6000 that results in 7206000

= 7733239
