Alright, let's work through 71031440 times 90578096 step by step
71031440 × 90578096 = 90578096 × (71031440)
+ 90578096 × 0 giving us 0
+ 90578096 × 40 producing 3623123840
+ 90578096 × 400 producing 36231238400
+ 90578096 × 1000 resulting in 90578096000
+ 90578096 × 30000 giving us 2717342880000
+ 90578096 × 000000 what gives us 0
+ 90578096 × 1000000 resulting in 90578096000000
+ 90578096 × 70000000 which equals 6340466720000000

= 6433892591338240
