No problem, we've got 5780 and 3646 to multiply
5780 × 3646 = 3646 × (5780)
+ 3646 × 0 that is equal 0
+ 3646 × 80 that results in 291680
+ 3646 × 700 resulting in 2552200
+ 3646 × 5000 resulting in 18230000

= 21073880
