Alright, let's work through 77829064 times 21157480 step by step
77829064 × 21157480 = 21157480 × (77829064)
+ 21157480 × 4 that is equal 84629920
+ 21157480 × 60 producing 1269448800
+ 21157480 × 000 which equals 0
+ 21157480 × 9000 that is equal 190417320000
+ 21157480 × 20000 which equals 423149600000
+ 21157480 × 800000 which equals 16925984000000
+ 21157480 × 7000000 producing 148102360000000
+ 21157480 × 70000000 resulting in 1481023600000000

= 1646666864998720
