No problem, we've got 3978 and 1687 to multiply
3978 × 1687 = 1687 × (3978)
+ 1687 × 8 what gives us 13496
+ 1687 × 70 producing 118090
+ 1687 × 900 resulting in 1518300
+ 1687 × 3000 that equals 5061000

= 6710886
