Are there any aircraft with propellers in the back?
There are. There is not even one such aircraft. By the way, the very first plane that the Wright brothers still flew was also with a pusher propeller.
The one mentioned in the question is the American B-36 Peacemaker strategic bomber, produced at the turn of the forties and fifties:
I must say that this aircraft makes an indelible impression "alive" ...
Another plane (well ... airplane) with a pusher propeller - B-10 manufactured by Mitchel Wing:
Comparable airplane (and sometimes seaplane) - Osprey II:
One more. Also "microsamolt", sold as a do-it-yourself kit (about nm at the end of the sixties wrote "Technics - youth"), - BD-5:
For thrill-seekers, a version with a jet engine (BD-5J) was produced.
But the "park" of pusher propeller vehicles is not limited to microsamolts. There is quite an "adult" business jet - Piaggio Aero P. 180 Avanti II:
There is also a domestic representative of this design - the M-12 Kasatik twin-engine aircraft:
Also available with skis and floats.
And a little about "bumping" on the wing. Actually front location increases efficiency of the propeller as a propeller. After all, the air flow flowing around the wing and thereby creating lift appears even on a standing aircraft, simply due to the work of the propellers. The second point is that the propeller located at the back is in the disturbed air flow (in the one that is already behind the wing or behind the fuselage). Read more about the advantages and disadvantages of the pushing screw here (though in English). Dry residue: for the pusher propeller, stabilization in flight is improved, the fuselage can be shorter, and it requires less vertical tail area and therefore is less susceptible to the "weather vane effect". For the pushing propeller, the effect on the fuselage and on the tail of the "rotating" air flow is reduced. The location of the propeller and power unit at the rear increases the safety of the aircraft.
Disadvantages: suboptimal weight distribution, risk of damage to the propeller during takeoff, increased noise, more difficult cooling of the engine (the engine will no longer be considered by the air flow from the propeller), and most importantly - reduced lifting force.
I will join the previous answer and add that in the history of our aviation there was one more aircraft with a rear propeller. It was the MiG-8, which made its first flight in 1945 and was made according to the "canard" aerodynamic scheme.