828505 has 4 divisors (see below), whose sum is σ = 994212. Its totient is φ = 662800.

The previous prime is 828449. The next prime is 828517. The reversal of 828505 is 505828.

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 535824 + 292681 = 732^2 + 541^2 .

It is not a de Polignac number, because 828505 - 2¹⁵ = 795737 is a prime.

It is a Duffinian 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, 82846 + ... + 82855.

It is an arithmetic number, because the mean of its divisors is an integer number (248553).

2⁸²⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

828505 is a deficient number, since it is larger than the sum of its proper divisors (165707).

828505 is a wasteful number, since it uses less digits than its factorization.

828505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165706.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 828505 is about 910.2225002712. Note that the first 3 decimals coincide. The cubic root of 828505 is about 93.9215053178.

The spelling of 828505 in words is "eight hundred twenty-eight thousand, five hundred five".