Alright, let's work through 87145500 times 20187621 step by step
87145500 × 20187621 = 20187621 × (87145500)
+ 20187621 × 0 that results in 0
+ 20187621 × 00 resulting in 0
+ 20187621 × 500 that is equal 10093810500
+ 20187621 × 5000 that equals 100938105000
+ 20187621 × 40000 that equals 807504840000
+ 20187621 × 100000 what gives us 2018762100000
+ 20187621 × 7000000 that is equal 141313347000000
+ 20187621 × 80000000 that results in 1615009680000000

= 1759260325855500
