Alright, let's work through 8620 times 7813 step by step
8620 × 7813 = 7813 × (8620)
+ 7813 × 0 which equals 0
+ 7813 × 20 giving us 156260
+ 7813 × 600 yielding 4687800
+ 7813 × 8000 producing 62504000

= 67348060
