Alright, let's work through 87663796 times 17858042 step by step
87663796 × 17858042 = 17858042 × (87663796)
+ 17858042 × 6 yielding 107148252
+ 17858042 × 90 that results in 1607223780
+ 17858042 × 700 that results in 12500629400
+ 17858042 × 3000 resulting in 53574126000
+ 17858042 × 60000 yielding 1071482520000
+ 17858042 × 600000 giving us 10714825200000
+ 17858042 × 7000000 that equals 125006294000000
+ 17858042 × 80000000 which equals 1428643360000000

= 1565503750847432
