Alright, let's work through 8520 times 8586 step by step
8520 × 8586 = 8586 × (8520)
+ 8586 × 0 resulting in 0
+ 8586 × 20 that is equal 171720
+ 8586 × 500 producing 4293000
+ 8586 × 8000 yielding 68688000

= 73152720
