Alright, let's work through 86203013 times 67378805 step by step
86203013 × 67378805 = 67378805 × (86203013)
+ 67378805 × 3 producing 202136415
+ 67378805 × 10 giving us 673788050
+ 67378805 × 000 yielding 0
+ 67378805 × 3000 what gives us 202136415000
+ 67378805 × 00000 which equals 0
+ 67378805 × 200000 which equals 13475761000000
+ 67378805 × 6000000 what gives us 404272830000000
+ 67378805 × 80000000 that results in 5390304400000000

= 5808256003339465
