No problem, we've got 3644 and 5787 to multiply
3644 × 5787 = 5787 × (3644)
+ 5787 × 4 which equals 23148
+ 5787 × 40 that results in 231480
+ 5787 × 600 resulting in 3472200
+ 5787 × 3000 resulting in 17361000

= 21087828
