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Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.
A heptagonal what? Prism, pyramid or something else?
7
Nine.
A heptagonal pyramid has 7 vertices. This is because a heptagonal pyramid is a polyhedron with a heptagonal (7-sided) base and 7 triangular faces that meet at a single point, which is the apex of the pyramid. Each of the 7 vertices of the base connects to the apex, resulting in a total of 7 vertices for the entire pyramid.