Alright, let's work through 87969857 times 72857592 step by step
87969857 × 72857592 = 72857592 × (87969857)
+ 72857592 × 7 giving us 510003144
+ 72857592 × 50 resulting in 3642879600
+ 72857592 × 800 which equals 58286073600
+ 72857592 × 9000 resulting in 655718328000
+ 72857592 × 60000 resulting in 4371455520000
+ 72857592 × 900000 that is equal 65571832800000
+ 72857592 × 7000000 giving us 510003144000000
+ 72857592 × 80000000 that results in 5828607360000000

= 6409271949604344
