521428904 has 16 divisors (see below), whose sum is σ = 998481600. Its totient is φ = 255167152.

The previous prime is 521428889. The next prime is 521428949. The reversal of 521428904 is 409824125.

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, 693014 + ... + 693765.

It is an arithmetic number, because the mean of its divisors is an integer number (62405100).

Almost surely, 2^521428904 is an apocalyptic number.

It is an amenable number.

521428904 is a deficient number, since it is larger than the sum of its proper divisors (477052696).

521428904 is a wasteful number, since it uses less digits than its factorization.

521428904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386832 (or 1386828 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 521428904 is about 22834.8178008934. The cubic root of 521428904 is about 804.8810461682.

The spelling of 521428904 in words is "five hundred twenty-one million, four hundred twenty-eight thousand, nine hundred four".