Alright, let's work through 1609 times 7787 step by step
1609 × 7787 = 7787 × (1609)
+ 7787 × 9 resulting in 70083
+ 7787 × 00 what gives us 0
+ 7787 × 600 yielding 4672200
+ 7787 × 1000 that equals 7787000

= 12529283
