Alright, let's work through 8780 times 8364 step by step
8780 × 8364 = 8364 × (8780)
+ 8364 × 0 that is equal 0
+ 8364 × 80 producing 669120
+ 8364 × 700 resulting in 5854800
+ 8364 × 8000 giving us 66912000

= 73435920
