521329904 has 20 divisors (see below), whose sum is σ = 1063239240. Its totient is φ = 246945600.

The previous prime is 521329873. The next prime is 521329933. The reversal of 521329904 is 409923125.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 857147 + ... + 857754.

It is an arithmetic number, because the mean of its divisors is an integer number (53161962).

Almost surely, 2^521329904 is an apocalyptic number.

It is an amenable number.

521329904 is an abundant number, since it is smaller than the sum of its proper divisors (541909336).

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

521329904 is a wasteful number, since it uses less digits than its factorization.

521329904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714928 (or 1714922 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 521329904 is about 22832.6499557104. The cubic root of 521329904 is about 804.8301039295.

The spelling of 521329904 in words is "five hundred twenty-one million, three hundred twenty-nine thousand, nine hundred four".