I suggest you call it a 28-sided polygon. That's much simpler than inventing, defining, and remembering lots of fancy names - which would really be a lot of wasted effort.
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a 4 sided shape is called a quadrilateral
== == A 56 sided shape is called a Pentacontakaihexagon.
A 600-sided shape is a hexcosiagon.
A twelve sided shape is a dodecagon.
A 2d nine sided shape is called a nonagon.