Alright, let's work through 6447 times 7804 step by step
6447 × 7804 = 7804 × (6447)
+ 7804 × 7 yielding 54628
+ 7804 × 40 that is equal 312160
+ 7804 × 400 giving us 3121600
+ 7804 × 6000 giving us 46824000

= 50312388
