No problem, we've got 4183 and 6436 to multiply
4183 × 6436 = 6436 × (4183)
+ 6436 × 3 which equals 19308
+ 6436 × 80 giving us 514880
+ 6436 × 100 giving us 643600
+ 6436 × 4000 which equals 25744000

= 26921788
