Alright, let's work through 81912468 times 52629987 step by step
81912468 × 52629987 = 52629987 × (81912468)
+ 52629987 × 8 which equals 421039896
+ 52629987 × 60 that equals 3157799220
+ 52629987 × 400 that results in 21051994800
+ 52629987 × 2000 that is equal 105259974000
+ 52629987 × 10000 which equals 526299870000
+ 52629987 × 900000 that results in 47366988300000
+ 52629987 × 1000000 what gives us 52629987000000
+ 52629987 × 80000000 that equals 4210398960000000

= 4311052125977916
