Alright, let's work through 40069641 times 77609621 step by step
40069641 × 77609621 = 77609621 × (40069641)
+ 77609621 × 1 producing 77609621
+ 77609621 × 40 giving us 3104384840
+ 77609621 × 600 resulting in 46565772600
+ 77609621 × 9000 which equals 698486589000
+ 77609621 × 60000 giving us 4656577260000
+ 77609621 × 000000 that equals 0
+ 77609621 × 0000000 what gives us 0
+ 77609621 × 40000000 which equals 3104384840000000

= 3109789651616061
