Alright, let's work through 13072870 times 90709123 step by step
13072870 × 90709123 = 90709123 × (13072870)
+ 90709123 × 0 that results in 0
+ 90709123 × 70 which equals 6349638610
+ 90709123 × 800 that equals 72567298400
+ 90709123 × 2000 what gives us 181418246000
+ 90709123 × 70000 yielding 6349638610000
+ 90709123 × 000000 which equals 0
+ 90709123 × 3000000 that equals 272127369000000
+ 90709123 × 10000000 that equals 907091230000000

= 1185828572793010
