Alright, let's work through 78723935 times 75635913 step by step
78723935 × 75635913 = 75635913 × (78723935)
+ 75635913 × 5 that equals 378179565
+ 75635913 × 30 which equals 2269077390
+ 75635913 × 900 that results in 68072321700
+ 75635913 × 3000 that results in 226907739000
+ 75635913 × 20000 giving us 1512718260000
+ 75635913 × 700000 which equals 52945139100000
+ 75635913 × 8000000 resulting in 605087304000000
+ 75635913 × 70000000 yielding 5294513910000000

= 5954356698677655
