Alright, let's work through 84524742 times 78242331 step by step
84524742 × 78242331 = 78242331 × (84524742)
+ 78242331 × 2 what gives us 156484662
+ 78242331 × 40 yielding 3129693240
+ 78242331 × 700 resulting in 54769631700
+ 78242331 × 4000 yielding 312969324000
+ 78242331 × 20000 that equals 1564846620000
+ 78242331 × 500000 giving us 39121165500000
+ 78242331 × 4000000 resulting in 312969324000000
+ 78242331 × 80000000 that results in 6259386480000000

= 6613412841253602
