Alright, let's work through 83408019 times 77678302 step by step
83408019 × 77678302 = 77678302 × (83408019)
+ 77678302 × 9 producing 699104718
+ 77678302 × 10 resulting in 776783020
+ 77678302 × 000 giving us 0
+ 77678302 × 8000 producing 621426416000
+ 77678302 × 00000 that is equal 0
+ 77678302 × 400000 that is equal 31071320800000
+ 77678302 × 3000000 producing 233034906000000
+ 77678302 × 80000000 that is equal 6214264160000000

= 6478993289103738
