No problem, we've got 6643 and 9620 to multiply
6643 × 9620 = 9620 × (6643)
+ 9620 × 3 resulting in 28860
+ 9620 × 40 which equals 384800
+ 9620 × 600 that results in 5772000
+ 9620 × 6000 which equals 57720000

= 63905660
