Alright, let's work through 80387296 times 10544906 step by step
80387296 × 10544906 = 10544906 × (80387296)
+ 10544906 × 6 yielding 63269436
+ 10544906 × 90 that is equal 949041540
+ 10544906 × 200 producing 2108981200
+ 10544906 × 7000 that results in 73814342000
+ 10544906 × 80000 yielding 843592480000
+ 10544906 × 300000 yielding 3163471800000
+ 10544906 × 0000000 what gives us 0
+ 10544906 × 80000000 giving us 843592480000000

= 847676479914176
