Let's calculate 8581 x 1642
8581 × 1642 = 1642 × (8581)
+ 1642 × 1 giving us 1642
+ 1642 × 80 that results in 131360
+ 1642 × 500 what gives us 821000
+ 1642 × 8000 what gives us 13136000

= 14090002
