Alright, let's work through 8364 times 7986 step by step
8364 × 7986 = 7986 × (8364)
+ 7986 × 4 what gives us 31944
+ 7986 × 60 giving us 479160
+ 7986 × 300 yielding 2395800
+ 7986 × 8000 that results in 63888000

= 66794904
