Alright, let's work through 77686804 times 53991798 step by step
77686804 × 53991798 = 53991798 × (77686804)
+ 53991798 × 4 which equals 215967192
+ 53991798 × 00 that equals 0
+ 53991798 × 800 that is equal 43193438400
+ 53991798 × 6000 which equals 323950788000
+ 53991798 × 80000 producing 4319343840000
+ 53991798 × 600000 producing 32395078800000
+ 53991798 × 7000000 resulting in 377942586000000
+ 53991798 × 70000000 which equals 3779425860000000

= 4194450228833592
