Alright, let's work through 6423 times 9664 step by step
6423 × 9664 = 9664 × (6423)
+ 9664 × 3 that equals 28992
+ 9664 × 20 what gives us 193280
+ 9664 × 400 what gives us 3865600
+ 9664 × 6000 that equals 57984000

= 62071872
