Alright, let's work through 67820891 times 18123956 step by step
67820891 × 18123956 = 18123956 × (67820891)
+ 18123956 × 1 that results in 18123956
+ 18123956 × 90 producing 1631156040
+ 18123956 × 800 producing 14499164800
+ 18123956 × 0000 that is equal 0
+ 18123956 × 20000 resulting in 362479120000
+ 18123956 × 800000 what gives us 14499164800000
+ 18123956 × 7000000 what gives us 126867692000000
+ 18123956 × 60000000 producing 1087437360000000

= 1229182844364796
