No problem, we've got 6391 and 8667 to multiply
6391 × 8667 = 8667 × (6391)
+ 8667 × 1 that results in 8667
+ 8667 × 90 that is equal 780030
+ 8667 × 300 giving us 2600100
+ 8667 × 6000 resulting in 52002000

= 55390797
