Let's calculate 8643 x 1997
8643 × 1997 = 1997 × (8643)
+ 1997 × 3 that is equal 5991
+ 1997 × 40 resulting in 79880
+ 1997 × 600 that is equal 1198200
+ 1997 × 8000 resulting in 15976000

= 17260071
