Alright, let's work through 7638 times 8407 step by step
7638 × 8407 = 8407 × (7638)
+ 8407 × 8 what gives us 67256
+ 8407 × 30 giving us 252210
+ 8407 × 600 resulting in 5044200
+ 8407 × 7000 that is equal 58849000

= 64212666
