No problem, we've got 1284 and 6405 to multiply
1284 × 6405 = 6405 × (1284)
+ 6405 × 4 producing 25620
+ 6405 × 80 that is equal 512400
+ 6405 × 200 what gives us 1281000
+ 6405 × 1000 what gives us 6405000

= 8224020
