No problem, we've got 6435 and 261 to multiply
6435 × 261 = 261 × (6435)
+ 261 × 5 which equals 1305
+ 261 × 30 which equals 7830
+ 261 × 400 which equals 104400
+ 261 × 6000 that is equal 1566000

= 1679535
