521328 has 20 divisors (see below), whose sum is σ = 1346888. Its totient is φ = 173760.

The previous prime is 521317. The next prime is 521329. The reversal of 521328 is 823125.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521328.

It is not an unprimeable number, because it can be changed into a prime (521329) by changing a digit.

521328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5383 + ... + 5478.

2⁵²¹³²⁸ is an apocalyptic number.

It is an amenable number.

521328 is an abundant number, since it is smaller than the sum of its proper divisors (825560).

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

521328 is a wasteful number, since it uses less digits than its factorization.

521328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872 (or 10866 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 521328 is about 722.0304702712. The cubic root of 521328 is about 80.4829124129.

The spelling of 521328 in words is "five hundred twenty-one thousand, three hundred twenty-eight".