Alright, let's work through 8601 times 1620 step by step
8601 × 1620 = 1620 × (8601)
+ 1620 × 1 what gives us 1620
+ 1620 × 00 that is equal 0
+ 1620 × 600 resulting in 972000
+ 1620 × 8000 producing 12960000

= 13933620
