Alright, let's work through 72090401 times 16390604 step by step
72090401 × 16390604 = 16390604 × (72090401)
+ 16390604 × 1 producing 16390604
+ 16390604 × 00 that is equal 0
+ 16390604 × 400 producing 6556241600
+ 16390604 × 0000 what gives us 0
+ 16390604 × 90000 giving us 1475154360000
+ 16390604 × 000000 that results in 0
+ 16390604 × 2000000 resulting in 32781208000000
+ 16390604 × 70000000 that is equal 1147342280000000

= 1181605214992204
