No problem, we've got 8629 and 6400 to multiply
8629 × 6400 = 6400 × (8629)
+ 6400 × 9 that equals 57600
+ 6400 × 20 that is equal 128000
+ 6400 × 600 resulting in 3840000
+ 6400 × 8000 producing 51200000

= 55225600
