No problem, we've got 6687 and 7776 to multiply
6687 × 7776 = 7776 × (6687)
+ 7776 × 7 which equals 54432
+ 7776 × 80 which equals 622080
+ 7776 × 600 which equals 4665600
+ 7776 × 6000 resulting in 46656000

= 51998112
