Alright, let's work through 8606 times 864 step by step
8606 × 864 = 864 × (8606)
+ 864 × 6 that equals 5184
+ 864 × 00 what gives us 0
+ 864 × 600 that results in 518400
+ 864 × 8000 giving us 6912000

= 7435584
