No problem, we've got 7783 and 1784 to multiply
7783 × 1784 = 1784 × (7783)
+ 1784 × 3 that equals 5352
+ 1784 × 80 that equals 142720
+ 1784 × 700 which equals 1248800
+ 1784 × 7000 yielding 12488000

= 13884872
