Alright, let's work through 8439 times 6465 step by step
8439 × 6465 = 6465 × (8439)
+ 6465 × 9 giving us 58185
+ 6465 × 30 that results in 193950
+ 6465 × 400 that equals 2586000
+ 6465 × 8000 which equals 51720000

= 54558135
