The last port Nmap still labels as a Solaris RPC slot; unregistered at IANA.
Like its neighbours, 32780 sits in IANA's unassigned 32778–32800 block. Nmap names it sometimes-rpc23 — "Sometimes an RPC port on my Solaris box" — and above this point its RPC naming becomes sparse. On Linux the port is ordinary ephemeral space (32768–60999), routinely used by outbound connections and by docker run -P publishes. Nothing chooses 32780 deliberately.
Expose with care
The exposure question belongs to whichever program grabbed the port; nothing about the number itself makes it safe or unsafe.
$ rpcinfo -p TARGETSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.