Alright, let's work through 81431827 times 87262827 step by step
81431827 × 87262827 = 87262827 × (81431827)
+ 87262827 × 7 that results in 610839789
+ 87262827 × 20 giving us 1745256540
+ 87262827 × 800 producing 69810261600
+ 87262827 × 1000 giving us 87262827000
+ 87262827 × 30000 what gives us 2617884810000
+ 87262827 × 400000 resulting in 34905130800000
+ 87262827 × 1000000 yielding 87262827000000
+ 87262827 × 80000000 which equals 6981026160000000

= 7105971431794929
