  We calculate the number density and luminosity of the sources of ultra high
energy cosmic rays (UHECRs), using the information about the small scale
anisotropies and the observed spectra. We find that the number of doublets and
triplets observed by AGASA can be best reproduced for a source density of $\sim
10^{-5} Mpc^{-3}$, with large uncertainties. The spectrum of UHECRs implies an
energy input of $\sim 6\times 10^{44} erg yr^{-1} Mpc^{-3}$ above $10^{19}$ eV
and an injection spectrum $\propto E^{-2.6}$. A flatter injection spectrum,
$E^{-2.4}$, can be adopted if the sources have luminosity evolution $\propto
(1+z)^4$. The combination of these two pieces of information suggests that the
single sources should on average have a cosmic ray luminosity above $10^{19}$
eV of $L_{source}\approx 2\times 10^{42} erg s^{-1}$, weakly dependent upon the
injection spectrum. Unfortunately, with the limited statistics of events
available at present, there are approximately one-two orders of magnitude
uncertainty in the source density provided above. We make predictions on the
expected performances of the Auger and EUSO experiments, with particular
attention for the expected improvements in our understanding of the nature of
the sources of UHECRs. We find that a critical experimental exposure $\Sigma_c$
exists, such that experiments with exposure larger than $\Sigma_c$ can detect
at least one event from each source at energies above $10^{20}$ eV. This
represents a unique opportunity to directly count and identify the sources of
UHECRs.

Astrophysics