Alright, let's work through 8639 times 8665 step by step
8639 × 8665 = 8665 × (8639)
+ 8665 × 9 that results in 77985
+ 8665 × 30 giving us 259950
+ 8665 × 600 yielding 5199000
+ 8665 × 8000 resulting in 69320000

= 74856935
