Alright, let's work through 99984463 times 5382403 step by step
99984463 × 5382403 = 5382403 × (99984463)
+ 5382403 × 3 resulting in 16147209
+ 5382403 × 60 that results in 322944180
+ 5382403 × 400 that results in 2152961200
+ 5382403 × 4000 yielding 21529612000
+ 5382403 × 80000 resulting in 430592240000
+ 5382403 × 900000 what gives us 4844162700000
+ 5382403 × 9000000 which equals 48441627000000
+ 5382403 × 90000000 giving us 484416270000000

= 538156673604589
