Alright, let's work through 78489439 times 66799736 step by step
78489439 × 66799736 = 66799736 × (78489439)
+ 66799736 × 9 yielding 601197624
+ 66799736 × 30 yielding 2003992080
+ 66799736 × 400 that equals 26719894400
+ 66799736 × 9000 that equals 601197624000
+ 66799736 × 80000 producing 5343978880000
+ 66799736 × 400000 what gives us 26719894400000
+ 66799736 × 8000000 giving us 534397888000000
+ 66799736 × 70000000 giving us 4675981520000000

= 5243073803988104
