Alright, let's work through 40209524 times 15312256 step by step
40209524 × 15312256 = 15312256 × (40209524)
+ 15312256 × 4 that is equal 61249024
+ 15312256 × 20 yielding 306245120
+ 15312256 × 500 which equals 7656128000
+ 15312256 × 9000 what gives us 137810304000
+ 15312256 × 00000 that equals 0
+ 15312256 × 200000 that results in 3062451200000
+ 15312256 × 0000000 resulting in 0
+ 15312256 × 40000000 yielding 612490240000000

= 615698525126144
