Alright, let's work through 80897609 times 43739286 step by step
80897609 × 43739286 = 43739286 × (80897609)
+ 43739286 × 9 yielding 393653574
+ 43739286 × 00 giving us 0
+ 43739286 × 600 that is equal 26243571600
+ 43739286 × 7000 resulting in 306175002000
+ 43739286 × 90000 that is equal 3936535740000
+ 43739286 × 800000 giving us 34991428800000
+ 43739286 × 0000000 that results in 0
+ 43739286 × 80000000 that results in 3499142880000000

= 3538403656767174
