505909164 has 12 divisors (see below), whose sum is σ = 1180454744. Its totient is φ = 168636384.

The previous prime is 505909141. The next prime is 505909189. The reversal of 505909164 is 461909505.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21079537 + ... + 21079560.

Almost surely, 2^505909164 is an apocalyptic number.

It is an amenable number.

505909164 is an abundant number, since it is smaller than the sum of its proper divisors (674545580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505909164 is a wasteful number, since it uses less digits than its factorization.

505909164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42159104 (or 42159102 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 505909164 is about 22492.4245914041. The cubic root of 505909164 is about 796.8150263392.

The spelling of 505909164 in words is "five hundred five million, nine hundred nine thousand, one hundred sixty-four".