pgAdmin4 combines geometry SRID and type

In binary, 28356 is 0110 110 1100 0100 (hexadecimal 6E C4)

In binary, 7259142 is 0110 110 1100 0100 0000 0110 (hexadecimal 6E C4 06)

Therefore, it seems safe to assume that a bitwise right shift 8 will remove the SRID from the combined code, and a bitwise AND mask with 0x00FF will capture the geometry type (though casting to bit(8) seems to be easier):

SELECT 7259142>>8 as srid, 7259142::bit(8) as type;

srid   type
28356  00000110

If you generate a number of different tables with different geometry types, you should be able to discern a bit(8) -> varchar(20) mapping CASE statement.