Alright, let's work through 78977794 times 6667877 step by step
78977794 × 6667877 = 6667877 × (78977794)
+ 6667877 × 4 yielding 26671508
+ 6667877 × 90 what gives us 600108930
+ 6667877 × 700 what gives us 4667513900
+ 6667877 × 7000 that equals 46675139000
+ 6667877 × 70000 yielding 466751390000
+ 6667877 × 900000 yielding 6001089300000
+ 6667877 × 8000000 producing 53343016000000
+ 6667877 × 70000000 producing 466751390000000

= 526614216123338
