Alright, let's work through 3657 times 7860 step by step
3657 × 7860 = 7860 × (3657)
+ 7860 × 7 that is equal 55020
+ 7860 × 50 that equals 393000
+ 7860 × 600 what gives us 4716000
+ 7860 × 3000 yielding 23580000

= 28744020
