Alright, let's work through 3607 times 7821 step by step
3607 × 7821 = 7821 × (3607)
+ 7821 × 7 that results in 54747
+ 7821 × 00 producing 0
+ 7821 × 600 what gives us 4692600
+ 7821 × 3000 that results in 23463000

= 28210347
