Alright, let's work through 67745578 times 78122497 step by step
67745578 × 78122497 = 78122497 × (67745578)
+ 78122497 × 8 what gives us 624979976
+ 78122497 × 70 that equals 5468574790
+ 78122497 × 500 that equals 39061248500
+ 78122497 × 5000 producing 390612485000
+ 78122497 × 40000 what gives us 3124899880000
+ 78122497 × 700000 resulting in 54685747900000
+ 78122497 × 7000000 producing 546857479000000
+ 78122497 × 60000000 that results in 4687349820000000

= 5292453714068266
