521628 has 24 divisors (see below), whose sum is σ = 1289232. Its totient is φ = 163584.

The previous prime is 521603. The next prime is 521641. The reversal of 521628 is 826125.

It is a junction number, because it is equal to n+sod(n) for n = 521598 and 521607.

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 521628.

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 7 ways as a sum of consecutive naturals, for example, 1075 + ... + 1482.

It is an arithmetic number, because the mean of its divisors is an integer number (53718).

2⁵²¹⁶²⁸ is an apocalyptic number.

It is an amenable number.

521628 is an abundant number, since it is smaller than the sum of its proper divisors (767604).

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

521628 is a wasteful number, since it uses less digits than its factorization.

521628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2579 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 521628 is about 722.2381878577. The cubic root of 521628 is about 80.4983475093.

The spelling of 521628 in words is "five hundred twenty-one thousand, six hundred twenty-eight".