Alright, let's work through 87686687 times 57177015 step by step
87686687 × 57177015 = 57177015 × (87686687)
+ 57177015 × 7 that results in 400239105
+ 57177015 × 80 yielding 4574161200
+ 57177015 × 600 resulting in 34306209000
+ 57177015 × 6000 that equals 343062090000
+ 57177015 × 80000 producing 4574161200000
+ 57177015 × 600000 yielding 34306209000000
+ 57177015 × 7000000 that equals 400239105000000
+ 57177015 × 80000000 giving us 4574161200000000

= 5013663017899305
