Alright, let's work through 6447 times 8891 step by step
6447 × 8891 = 8891 × (6447)
+ 8891 × 7 which equals 62237
+ 8891 × 40 resulting in 355640
+ 8891 × 400 what gives us 3556400
+ 8891 × 6000 that equals 53346000

= 57320277
