I don't have an ASE 16 server in front of me at the moment, but the following seems to work on ASE 15.7 ...
Try looking up the object/index/partition via the partition id (ptnid = 719832583) and index id (indid = 3), eg:
==================
select object_name(id),
index_name(db_id(),id,indid),
partition_name(indid,partitionid)
from syspartitions
where partitionid = 719832583
and indid = 3
==================
