The cube have:
-- six (6) faces
-- twelve (12) edges
-- zero (0) curved surfaces
-- eight (8) vertices
It depends on how many cubes in the stack and what shape they form.
6 faces12 edges8 vertices
4 vetices 4 faces 4 edges
In 3 dimensions, at least, a cube has no curved edges.
A cube has 8 vertices and 12 edges (and 6 faces)