528809 has 4 divisors (see below), whose sum is σ = 537540. Its totient is φ = 520080.

The previous prime is 528799. The next prime is 528811. The reversal of 528809 is 908825.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102400 + 426409 = 320^2 + 653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-528809 is a prime.

It is an Ulam number.

It is a Duffinian number.

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 528809.

It is not an unprimeable number, because it can be changed into a prime (528509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4274 + ... + 4395.

It is an arithmetic number, because the mean of its divisors is an integer number (134385).

2⁵²⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

528809 is a deficient number, since it is larger than the sum of its proper divisors (8731).

528809 is an equidigital number, since it uses as much as digits as its factorization.

528809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 528809 is about 727.1925467165. The cubic root of 528809 is about 80.8660591855.

The spelling of 528809 in words is "five hundred twenty-eight thousand, eight hundred nine".