Alright, let's work through 54086079 times 86389242 step by step
54086079 × 86389242 = 86389242 × (54086079)
+ 86389242 × 9 which equals 777503178
+ 86389242 × 70 producing 6047246940
+ 86389242 × 000 producing 0
+ 86389242 × 6000 producing 518335452000
+ 86389242 × 80000 yielding 6911139360000
+ 86389242 × 000000 which equals 0
+ 86389242 × 4000000 which equals 345556968000000
+ 86389242 × 50000000 resulting in 4319462100000000

= 4672455367562118
