Alright, let's work through 5639 times 3730 step by step
5639 × 3730 = 3730 × (5639)
+ 3730 × 9 yielding 33570
+ 3730 × 30 yielding 111900
+ 3730 × 600 that equals 2238000
+ 3730 × 5000 yielding 18650000

= 21033470
