521634864 has 20 divisors (see below), whose sum is σ = 1347556856. Its totient is φ = 173878272.

The previous prime is 521634857. The next prime is 521634887. The reversal of 521634864 is 468436125.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5433649 + ... + 5433744.

Almost surely, 2^521634864 is an apocalyptic number.

It is an amenable number.

521634864 is an abundant number, since it is smaller than the sum of its proper divisors (825921992).

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

521634864 is a wasteful number, since it uses less digits than its factorization.

521634864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10867404 (or 10867398 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 521634864 is about 22839.3271354478. The cubic root of 521634864 is about 804.9870059500.

The spelling of 521634864 in words is "five hundred twenty-one million, six hundred thirty-four thousand, eight hundred sixty-four".