Alright, let's work through 75878684 times 77720013 step by step
75878684 × 77720013 = 77720013 × (75878684)
+ 77720013 × 4 that results in 310880052
+ 77720013 × 80 that equals 6217601040
+ 77720013 × 600 producing 46632007800
+ 77720013 × 8000 that results in 621760104000
+ 77720013 × 70000 what gives us 5440400910000
+ 77720013 × 800000 which equals 62176010400000
+ 77720013 × 5000000 yielding 388600065000000
+ 77720013 × 70000000 what gives us 5440400910000000

= 5897292306902892
