528731 has 4 divisors (see below), whose sum is σ = 604272. Its totient is φ = 453192.

The previous prime is 528719. The next prime is 528763. The reversal of 528731 is 137825.

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

It is a cyclic number.

It is not a de Polignac number, because 528731 - 2⁶ = 528667 is a prime.

It is a super-2 number, since 2×528731² = 559112940722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 528731.

It is not an unprimeable number, because it can be changed into a prime (528791) 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, 37760 + ... + 37773.

It is an arithmetic number, because the mean of its divisors is an integer number (151068).

2⁵²⁸⁷³¹ is an apocalyptic number.

528731 is a deficient number, since it is larger than the sum of its proper divisors (75541).

528731 is an equidigital number, since it uses as much as digits as its factorization.

528731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75540.

The product of its digits is 1680, while the sum is 26.

The square root of 528731 is about 727.1389138260. The cubic root of 528731 is about 80.8620830412.

The spelling of 528731 in words is "five hundred twenty-eight thousand, seven hundred thirty-one".