Alright, let's work through 81194820 times 31908985 step by step
81194820 × 31908985 = 31908985 × (81194820)
+ 31908985 × 0 that equals 0
+ 31908985 × 20 giving us 638179700
+ 31908985 × 800 that results in 25527188000
+ 31908985 × 4000 giving us 127635940000
+ 31908985 × 90000 producing 2871808650000
+ 31908985 × 100000 yielding 3190898500000
+ 31908985 × 1000000 that equals 31908985000000
+ 31908985 × 80000000 resulting in 2552718800000000

= 2590844293457700
