Alright, let's work through 51386250 times 87267878 step by step
51386250 × 87267878 = 87267878 × (51386250)
+ 87267878 × 0 which equals 0
+ 87267878 × 50 that equals 4363393900
+ 87267878 × 200 that equals 17453575600
+ 87267878 × 6000 that results in 523607268000
+ 87267878 × 80000 that equals 6981430240000
+ 87267878 × 300000 that results in 26180363400000
+ 87267878 × 1000000 that equals 87267878000000
+ 87267878 × 50000000 giving us 4363393900000000

= 4484368995877500
