Alright, let's work through 7815 times 8386 step by step
7815 × 8386 = 8386 × (7815)
+ 8386 × 5 that is equal 41930
+ 8386 × 10 what gives us 83860
+ 8386 × 800 that equals 6708800
+ 8386 × 7000 yielding 58702000

= 65536590
