No problem, we've got 2479 and 6400 to multiply
2479 × 6400 = 6400 × (2479)
+ 6400 × 9 that results in 57600
+ 6400 × 70 that equals 448000
+ 6400 × 400 resulting in 2560000
+ 6400 × 2000 resulting in 12800000

= 15865600
