We present the analysis of the muon events with all muon multiplicities collected during 21804 h of operation of the first LVD tower. The measured depth-angular distribution of muon intensities has been used to obtain the normalization factor A the power index $\gamma$ of the primary all-nucleon spectrum, and the ratio $R_c$ of the prompt muon flux to that of π mesons—the main parameters which determine the spectrum of cosmic ray muons at the sea level. The values of $\gamma =2.77\mathrm{}\pm 0.05$ (68% C.L.) and $R_c<2.0\mathrm{}\times {10}^{-3}$ (95% C.L.) have been obtained. The upper limit to the prompt muon flux favors the models of charm production based on QGSM and the dual parton model.