No problem, we've got 6478 and 3648 to multiply
6478 × 3648 = 3648 × (6478)
+ 3648 × 8 which equals 29184
+ 3648 × 70 what gives us 255360
+ 3648 × 400 that equals 1459200
+ 3648 × 6000 giving us 21888000

= 23631744
