521487428 has 48 divisors (see below), whose sum is σ = 1139612544. Its totient is φ = 202851840.

The previous prime is 521487413. The next prime is 521487431. The reversal of 521487428 is 824784125.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300050 + ... + 301782.

It is an arithmetic number, because the mean of its divisors is an integer number (23741928).

Almost surely, 2^521487428 is an apocalyptic number.

It is an amenable number.

521487428 is an abundant number, since it is smaller than the sum of its proper divisors (618125116).

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

521487428 is a wasteful number, since it uses less digits than its factorization.

521487428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732 (or 2730 counting only the distinct ones).

The product of its digits is 143360, while the sum is 41.

The square root of 521487428 is about 22836.0992290715. The cubic root of 521487428 is about 804.9111577173.

The spelling of 521487428 in words is "five hundred twenty-one million, four hundred eighty-seven thousand, four hundred twenty-eight".