Alright, let's work through 80485528 times 97535409 step by step
80485528 × 97535409 = 97535409 × (80485528)
+ 97535409 × 8 what gives us 780283272
+ 97535409 × 20 yielding 1950708180
+ 97535409 × 500 producing 48767704500
+ 97535409 × 5000 what gives us 487677045000
+ 97535409 × 80000 giving us 7802832720000
+ 97535409 × 400000 that is equal 39014163600000
+ 97535409 × 0000000 resulting in 0
+ 97535409 × 80000000 what gives us 7802832720000000

= 7850188892060952
