No problem, we've got 1624 and 8721 to multiply
1624 × 8721 = 8721 × (1624)
+ 8721 × 4 resulting in 34884
+ 8721 × 20 that is equal 174420
+ 8721 × 600 what gives us 5232600
+ 8721 × 1000 which equals 8721000

= 14162904
