Alright, let's work through 6446 times 4478 step by step
6446 × 4478 = 4478 × (6446)
+ 4478 × 6 that is equal 26868
+ 4478 × 40 that results in 179120
+ 4478 × 400 producing 1791200
+ 4478 × 6000 what gives us 26868000

= 28865188
