Alright, let's work through 8351962 times 51259637 step by step
8351962 × 51259637 = 51259637 × (8351962)
+ 51259637 × 2 which equals 102519274
+ 51259637 × 60 that results in 3075578220
+ 51259637 × 900 yielding 46133673300
+ 51259637 × 1000 that results in 51259637000
+ 51259637 × 50000 that results in 2562981850000
+ 51259637 × 300000 what gives us 15377891100000
+ 51259637 × 8000000 giving us 410077096000000

= 428118540357794
