48 is a solitary number.
48 is equal to 6!!, the double factorial of 6.
Ignoring weekdays, the Julian calendar repeats every 48 months.
In chess Edit
It is also the number of possible knight moves in 4×4 minichess.
In googology Edit
In Greek-based number-naming systems, 48 is associated with prefix "octotetraconta-", and with prefix "octoquadraginti-" in Latin systems.