Alright, let's work through 6387 times 4443 step by step
6387 × 4443 = 4443 × (6387)
+ 4443 × 7 producing 31101
+ 4443 × 80 resulting in 355440
+ 4443 × 300 that equals 1332900
+ 4443 × 6000 resulting in 26658000

= 28377441
