Alright, let's work through 12007578 times 51789017 step by step
12007578 × 51789017 = 51789017 × (12007578)
+ 51789017 × 8 that results in 414312136
+ 51789017 × 70 what gives us 3625231190
+ 51789017 × 500 giving us 25894508500
+ 51789017 × 7000 producing 362523119000
+ 51789017 × 00000 producing 0
+ 51789017 × 000000 producing 0
+ 51789017 × 2000000 that results in 103578034000000
+ 51789017 × 10000000 resulting in 517890170000000

= 621860661170826
