Bluebulb Projects' The Measure of Things presents:
900 is about one-and-one-tenth times the number of Population of Vatican City.
In other words, it's 1.07 times the count of Population of Vatican City, and the count of Population of Vatican City is 0.935 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)