828665 has 8 divisors (see below), whose sum is σ = 1053000. Its totient is φ = 623872.

The previous prime is 828649. The next prime is 828673. The reversal of 828665 is 566828.

It can be written as a sum of positive squares in 4 ways, for example, as 59536 + 769129 = 244^2 + 877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 828665 - 2⁴ = 828649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4790 + ... + 4959.

It is an arithmetic number, because the mean of its divisors is an integer number (131625).

2⁸²⁸⁶⁶⁵ is an apocalyptic number.

828665 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

828665 is a deficient number, since it is larger than the sum of its proper divisors (224335).

828665 is a wasteful number, since it uses less digits than its factorization.

828665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9771.

The product of its digits is 23040, while the sum is 35.

The square root of 828665 is about 910.3103866265. The cubic root of 828665 is about 93.9275509356.

The spelling of 828665 in words is "eight hundred twenty-eight thousand, six hundred sixty-five".