Bluebulb Projects' The Measure of Things presents:
520 is about three-fifths the number of Population of Vatican City.
In other words, it's 0.6180 times the count of Population of Vatican City, and the count of Population of Vatican City is 1.620 times that amount.
(a.k.a. Vatican City State, a.k.a. Stato della Città del Vaticano
, a.k.a. Status Civitatis Vaticanae
) (Rome, Italy) (2014 estimates; permanent residents only)