528665 has 4 divisors (see below), whose sum is σ = 634404. Its totient is φ = 422928.

The previous prime is 528659. The next prime is 528667. The reversal of 528665 is 566825.

It is a happy number.

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 238144 + 290521 = 488^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 528665 - 2¹⁸ = 266521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (528667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52862 + ... + 52871.

It is an arithmetic number, because the mean of its divisors is an integer number (158601).

2⁵²⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

528665 is a deficient number, since it is larger than the sum of its proper divisors (105739).

528665 is a wasteful number, since it uses less digits than its factorization.

528665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105738.

The product of its digits is 14400, while the sum is 32.

The square root of 528665 is about 727.0935290594. The cubic root of 528665 is about 80.8587183059.

The spelling of 528665 in words is "five hundred twenty-eight thousand, six hundred sixty-five".