16 doors in total -
Diehl
"The Airbus A380 will be the first commercial aircraft equipped with a doors and slides management system. In its basic version A380-800, the Airbus will have sixteen passenger and two cargo doors. In order to maximize handling comfort and safety - especially in case of the emergency - doors and hatches will be centrally monitored and electrically actuated through the DSMS for the first time.
The DSMS consists of electronic computers, sensors, and actuators. The core of the DSMS is the doors and slides management control unit (DSMCU), a central computer where all status and control data for doors, hatches, and escape slides are gathered. In addition, there is a local door controller (LDC) installed in every door to individually control every single door. Each LDC has an emergency power supply allowing the doors to be opened even in the event of a failure of the main power buses in the aircraft. Special sensors are meant to determine the position of the body after emergency landing to make sure that the escape slides will be extended to the correct length."
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There are eight slides a side: six on the upper deck, eight on the main-deck doors, and two on the wing/belly fairing. Each is 15m (49ft) long.
With complex underside bracing for rigidity, all the slides except the single-track wing/belly units will accommodate two people side-by-side. The wing/belly slides run parallel with the fuselage until they reach the wing trailing edge, then slope down.
FAA overview