521664132 has 96 divisors (see below), whose sum is σ = 1378460160. Its totient is φ = 152167680.

The previous prime is 521664113. The next prime is 521664137. The reversal of 521664132 is 231466125.

It is a self number, because there is not a number n which added to its sum of digits gives 521664132.

It is not an unprimeable number, because it can be changed into a prime (521664137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 413719 + ... + 414977.

It is an arithmetic number, because the mean of its divisors is an integer number (14358960).

Almost surely, 2^521664132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521664132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689230080).

521664132 is an abundant number, since it is smaller than the sum of its proper divisors (856796028).

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

521664132 is a wasteful number, since it uses less digits than its factorization.

521664132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 1391 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 521664132 is about 22839.9678633749. The cubic root of 521664132 is about 805.0020611292.

The spelling of 521664132 in words is "five hundred twenty-one million, six hundred sixty-four thousand, one hundred thirty-two".