Alright, let's work through 78728213 times 16723376 step by step
78728213 × 16723376 = 16723376 × (78728213)
+ 16723376 × 3 that results in 50170128
+ 16723376 × 10 what gives us 167233760
+ 16723376 × 200 that results in 3344675200
+ 16723376 × 8000 that results in 133787008000
+ 16723376 × 20000 producing 334467520000
+ 16723376 × 700000 that is equal 11706363200000
+ 16723376 × 8000000 resulting in 133787008000000
+ 16723376 × 70000000 giving us 1170636320000000

= 1316601507807088
