No problem, we've got 8640 and 6317 to multiply
8640 × 6317 = 6317 × (8640)
+ 6317 × 0 that is equal 0
+ 6317 × 40 what gives us 252680
+ 6317 × 600 resulting in 3790200
+ 6317 × 8000 what gives us 50536000

= 54578880
