Alright, let's work through 68137884 times 90236847 step by step
68137884 × 90236847 = 90236847 × (68137884)
+ 90236847 × 4 what gives us 360947388
+ 90236847 × 80 producing 7218947760
+ 90236847 × 800 giving us 72189477600
+ 90236847 × 7000 that is equal 631657929000
+ 90236847 × 30000 that equals 2707105410000
+ 90236847 × 100000 what gives us 9023684700000
+ 90236847 × 8000000 that equals 721894776000000
+ 90236847 × 60000000 which equals 5414210820000000

= 6148547813411748
