828565 has 4 divisors (see below), whose sum is σ = 994284. Its totient is φ = 662848.

The previous prime is 828557. The next prime is 828577. The reversal of 828565 is 565828.

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 649636 + 178929 = 806^2 + 423^2 .

It is a cyclic number.

It is not a de Polignac number, because 828565 - 2³ = 828557 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 828565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82852 + ... + 82861.

It is an arithmetic number, because the mean of its divisors is an integer number (248571).

2⁸²⁸⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

828565 is a deficient number, since it is larger than the sum of its proper divisors (165719).

828565 is a wasteful number, since it uses less digits than its factorization.

828565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165718.

The product of its digits is 19200, while the sum is 34.

The square root of 828565 is about 910.2554586488. The cubic root of 828565 is about 93.9237725157.

The spelling of 828565 in words is "eight hundred twenty-eight thousand, five hundred sixty-five".