521928 has 48 divisors (see below), whose sum is σ = 1544400. Its totient is φ = 157920.

The previous prime is 521923. The next prime is 521929. The reversal of 521928 is 829125.

It is a super-3 number, since 3×521928³ = 426533398721312256, which contains 333 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (521923) by changing a digit.

521928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 463 + ... + 1121.

It is an arithmetic number, because the mean of its divisors is an integer number (32175).

2⁵²¹⁹²⁸ 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 521928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772200).

521928 is an abundant number, since it is smaller than the sum of its proper divisors (1022472).

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

521928 is a wasteful number, since it uses less digits than its factorization.

521928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 675 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 521928 is about 722.4458457213. The cubic root of 521928 is about 80.5137766887.

The spelling of 521928 in words is "five hundred twenty-one thousand, nine hundred twenty-eight".