Alright, let's work through 23789990 times 79966355 step by step
23789990 × 79966355 = 79966355 × (23789990)
+ 79966355 × 0 what gives us 0
+ 79966355 × 90 what gives us 7196971950
+ 79966355 × 900 that results in 71969719500
+ 79966355 × 9000 giving us 719697195000
+ 79966355 × 80000 what gives us 6397308400000
+ 79966355 × 700000 that equals 55976448500000
+ 79966355 × 3000000 resulting in 239899065000000
+ 79966355 × 20000000 what gives us 1599327100000000

= 1902398785786450
