Alright, let's work through 77947540 times 83130729 step by step
77947540 × 83130729 = 83130729 × (77947540)
+ 83130729 × 0 resulting in 0
+ 83130729 × 40 resulting in 3325229160
+ 83130729 × 500 resulting in 41565364500
+ 83130729 × 7000 resulting in 581915103000
+ 83130729 × 40000 producing 3325229160000
+ 83130729 × 900000 producing 74817656100000
+ 83130729 × 7000000 yielding 581915103000000
+ 83130729 × 70000000 which equals 5819151030000000

= 6479835823956660
