The system requirements will be very low to actually run the game.
Minimum Windows XP, Windows Vista, Windows 7, Windows 8 Dual core CPU (Intel Core 2 Duo or AMD Athlon64 X2) 2 GB RAM 256 MB dedicated video RAM 2048 x 2048 maximum texture size. OpenGL 2.0 compatibility Hard Drive ~500MB 1280 x 720 Minimum Resolution
Recommended Quad core CPU 512 MB dedicated video RAM
The executable will be 32 bit, there were no benefits to using 64 bit in my tests. If anything it was slightly slower.