Alright, let's work through 80720531 times 87601345 step by step
80720531 × 87601345 = 87601345 × (80720531)
+ 87601345 × 1 what gives us 87601345
+ 87601345 × 30 yielding 2628040350
+ 87601345 × 500 yielding 43800672500
+ 87601345 × 0000 resulting in 0
+ 87601345 × 20000 that is equal 1752026900000
+ 87601345 × 700000 which equals 61320941500000
+ 87601345 × 0000000 that equals 0
+ 87601345 × 80000000 producing 7008107600000000

= 7071227084714195
