Alright, let's work through 83968680 times 43201089 step by step
83968680 × 43201089 = 43201089 × (83968680)
+ 43201089 × 0 that results in 0
+ 43201089 × 80 yielding 3456087120
+ 43201089 × 600 what gives us 25920653400
+ 43201089 × 8000 that is equal 345608712000
+ 43201089 × 60000 that equals 2592065340000
+ 43201089 × 900000 that is equal 38880980100000
+ 43201089 × 3000000 that equals 129603267000000
+ 43201089 × 80000000 yielding 3456087120000000

= 3627538417892520
