Alright, let's work through 84757908 times 51640383 step by step
84757908 × 51640383 = 51640383 × (84757908)
+ 51640383 × 8 what gives us 413123064
+ 51640383 × 00 what gives us 0
+ 51640383 × 900 resulting in 46476344700
+ 51640383 × 7000 yielding 361482681000
+ 51640383 × 50000 that results in 2582019150000
+ 51640383 × 700000 giving us 36148268100000
+ 51640383 × 4000000 producing 206561532000000
+ 51640383 × 80000000 resulting in 4131230640000000

= 4376930831398764
