Alright, let's work through 18987518 times 87142390 step by step
18987518 × 87142390 = 87142390 × (18987518)
+ 87142390 × 8 producing 697139120
+ 87142390 × 10 that equals 871423900
+ 87142390 × 500 that results in 43571195000
+ 87142390 × 7000 giving us 609996730000
+ 87142390 × 80000 what gives us 6971391200000
+ 87142390 × 900000 that is equal 78428151000000
+ 87142390 × 8000000 giving us 697139120000000
+ 87142390 × 10000000 what gives us 871423900000000

= 1654617698688020
