Alright, let's work through 78406305 times 75079528 step by step
78406305 × 75079528 = 75079528 × (78406305)
+ 75079528 × 5 producing 375397640
+ 75079528 × 00 which equals 0
+ 75079528 × 300 what gives us 22523858400
+ 75079528 × 6000 which equals 450477168000
+ 75079528 × 00000 what gives us 0
+ 75079528 × 400000 what gives us 30031811200000
+ 75079528 × 8000000 yielding 600636224000000
+ 75079528 × 70000000 what gives us 5255566960000000

= 5886708371624040
