Mobile operating machine, comprising a motor vehicle moved by at least one internal combustion motor , an articulated arm able to deliver concrete and a pumping unit , said mobile operating machine comprising a drive apparatus provided with: at least one hydraulic pump configured to pump a working fluid and to determine the drive of said pumping unit and at least one hydraulic pump configured to pump a working fluid and determine the drive of said articulated arm ; at least one electromechanical machine connected to said internal combustion motor , to said hydraulic pumps and to an electric accumulator and configured to assume at least a first operating condition in which it converts the mechanical energy of said internal combustion motor into electric energy to be accumulated in said electric accumulator , and a second operating condition in which it converts the electric energy of said electric accumulator into mechanical energy to drive at least one of said hydraulic pumps ; at least a first drive axis (A1) and at least a second drive axis (A2), adjacent and connected to said first drive axis (A1) by means of a transmission device , said hydraulic pumps being positioned on said second drive axis (A2); the mobile operating machine being characterised in that the pumping unit is configured to pump concrete to said articulated arm , in that along the first axis (A1) said internal combustion motor and said electromechanical machine are positioned and in that at least another hydraulic pump configured to pump a working fluid and to determine the drive of a rotatable drum to mix the concrete, said other hydraulic pump being positioned on said first drive axis (A1) along which said internal combustion motor and said electromechanical machine are positioned. at least one hydraulic pump configured to pump a working fluid and to determine the drive of said pumping unit and at least one hydraulic pump configured to pump a working fluid and determine the drive of said articulated arm ; at least one electromechanical machine connected to said internal combustion motor , to said hydraulic pumps and to an electric accumulator and configured to assume at least a first operating condition in which it converts the mechanical energy of said internal combustion motor into electric energy to be accumulated in said electric accumulator , and a second operating condition in which it converts the electric energy of said electric accumulator into mechanical energy to drive at least one of said hydraulic pumps ; at least a first drive axis (A1) and at least a second drive axis (A2), adjacent and connected to said first drive axis (A1) by means of a transmission device , said hydraulic pumps being positioned on said second drive axis (A2); the mobile operating machine being characterised in that the pumping unit is configured to pump concrete to said articulated arm , in that along the first axis (A1) said internal combustion motor and said electromechanical machine are positioned and in that at least another hydraulic pump configured to pump a working fluid and to determine the drive of a rotatable drum to mix the concrete, said other hydraulic pump being positioned on said first drive axis (A1) along which said internal combustion motor and said electromechanical machine are positioned. <EOS>