828745 has 4 divisors (see below), whose sum is σ = 994500. Its totient is φ = 662992.

The previous prime is 828743. The next prime is 828757. The reversal of 828745 is 547828.

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 646416 + 182329 = 804^2 + 427^2 .

It is a cyclic number.

It is not a de Polignac number, because 828745 - 2¹ = 828743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 828745.

It is not an unprimeable number, because it can be changed into a prime (828743) 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, 82870 + ... + 82879.

It is an arithmetic number, because the mean of its divisors is an integer number (248625).

2⁸²⁸⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

828745 is a deficient number, since it is larger than the sum of its proper divisors (165755).

828745 is a wasteful number, since it uses less digits than its factorization.

828745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165754.

The product of its digits is 17920, while the sum is 34.

The square root of 828745 is about 910.3543266223. The cubic root of 828745 is about 93.9305734526.

The spelling of 828745 in words is "eight hundred twenty-eight thousand, seven hundred forty-five".