Alright, let's work through 7647 times 8439 step by step
7647 × 8439 = 8439 × (7647)
+ 8439 × 7 which equals 59073
+ 8439 × 40 that equals 337560
+ 8439 × 600 that equals 5063400
+ 8439 × 7000 yielding 59073000

= 64533033
