Alright, let's work through 87394814 times 5825926 step by step
87394814 × 5825926 = 5825926 × (87394814)
+ 5825926 × 4 yielding 23303704
+ 5825926 × 10 giving us 58259260
+ 5825926 × 800 giving us 4660740800
+ 5825926 × 4000 yielding 23303704000
+ 5825926 × 90000 that results in 524333340000
+ 5825926 × 300000 yielding 1747777800000
+ 5825926 × 7000000 yielding 40781482000000
+ 5825926 × 80000000 yielding 466074080000000

= 509155719147764
