520509972 has 24 divisors (see below), whose sum is σ = 1220632000. Its totient is φ = 172630656.

The previous prime is 520509967. The next prime is 520509973. The reversal of 520509972 is 279905025.

It is a self number, because there is not a number n which added to its sum of digits gives 520509972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520509973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106597 + ... + 111372.

Almost surely, 2^520509972 is an apocalyptic number.

It is an amenable number.

520509972 is an abundant number, since it is smaller than the sum of its proper divisors (700122028).

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

520509972 is a wasteful number, since it uses less digits than its factorization.

520509972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218175 (or 218173 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 520509972 is about 22814.6876375724. The cubic root of 520509972 is about 804.4079450020.

The spelling of 520509972 in words is "five hundred twenty million, five hundred nine thousand, nine hundred seventy-two".