Alright, let's work through 80907498 times 98722987 step by step
80907498 × 98722987 = 98722987 × (80907498)
+ 98722987 × 8 resulting in 789783896
+ 98722987 × 90 yielding 8885068830
+ 98722987 × 400 that is equal 39489194800
+ 98722987 × 7000 that equals 691060909000
+ 98722987 × 00000 yielding 0
+ 98722987 × 900000 which equals 88850688300000
+ 98722987 × 0000000 what gives us 0
+ 98722987 × 80000000 giving us 7897838960000000

= 7987429873256526
