No problem, we've got 7644 and 7878 to multiply
7644 × 7878 = 7878 × (7644)
+ 7878 × 4 what gives us 31512
+ 7878 × 40 yielding 315120
+ 7878 × 600 giving us 4726800
+ 7878 × 7000 which equals 55146000

= 60219432
