Alright, let's work through 85045841 times 87991245 step by step
85045841 × 87991245 = 87991245 × (85045841)
+ 87991245 × 1 giving us 87991245
+ 87991245 × 40 that equals 3519649800
+ 87991245 × 800 yielding 70392996000
+ 87991245 × 5000 yielding 439956225000
+ 87991245 × 40000 that equals 3519649800000
+ 87991245 × 000000 what gives us 0
+ 87991245 × 5000000 yielding 439956225000000
+ 87991245 × 80000000 which equals 7039299600000000

= 7483289431662045
