No problem, we've got 3874 and 8640 to multiply
3874 × 8640 = 8640 × (3874)
+ 8640 × 4 that equals 34560
+ 8640 × 70 that equals 604800
+ 8640 × 800 what gives us 6912000
+ 8640 × 3000 resulting in 25920000

= 33471360
