828561 has 4 divisors (see below), whose sum is σ = 1104752. Its totient is φ = 552372.

The previous prime is 828557. The next prime is 828577. The reversal of 828561 is 165828.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 828561 - 2² = 828557 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (828361) 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, 138091 + ... + 138096.

It is an arithmetic number, because the mean of its divisors is an integer number (276188).

2⁸²⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

828561 is a deficient number, since it is larger than the sum of its proper divisors (276191).

828561 is a wasteful number, since it uses less digits than its factorization.

828561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276190.

The product of its digits is 3840, while the sum is 30.

The square root of 828561 is about 910.2532614608. The cubic root of 828561 is about 93.9236213726.

The spelling of 828561 in words is "eight hundred twenty-eight thousand, five hundred sixty-one".