No problem, we've got 8642 and 8387 to multiply
8642 × 8387 = 8387 × (8642)
+ 8387 × 2 what gives us 16774
+ 8387 × 40 giving us 335480
+ 8387 × 600 resulting in 5032200
+ 8387 × 8000 that is equal 67096000

= 72480454
