Alright, let's work through 80398748 times 35473178 step by step
80398748 × 35473178 = 35473178 × (80398748)
+ 35473178 × 8 giving us 283785424
+ 35473178 × 40 that is equal 1418927120
+ 35473178 × 700 that equals 24831224600
+ 35473178 × 8000 that results in 283785424000
+ 35473178 × 90000 that is equal 3192586020000
+ 35473178 × 300000 yielding 10641953400000
+ 35473178 × 0000000 resulting in 0
+ 35473178 × 80000000 resulting in 2837854240000000

= 2851999098781144
