Alright, let's work through 8740387 times 76621596 step by step
8740387 × 76621596 = 76621596 × (8740387)
+ 76621596 × 7 that results in 536351172
+ 76621596 × 80 producing 6129727680
+ 76621596 × 300 what gives us 22986478800
+ 76621596 × 0000 what gives us 0
+ 76621596 × 40000 that is equal 3064863840000
+ 76621596 × 700000 which equals 53635117200000
+ 76621596 × 8000000 that equals 612972768000000

= 669702401597652
