No problem, we've got 8140 and 2564 to multiply
8140 × 2564 = 2564 × (8140)
+ 2564 × 0 resulting in 0
+ 2564 × 40 resulting in 102560
+ 2564 × 100 yielding 256400
+ 2564 × 8000 resulting in 20512000

= 20870960
