828661 has 4 divisors (see below), whose sum is σ = 855424. Its totient is φ = 801900.

The previous prime is 828649. The next prime is 828673. The reversal of 828661 is 166828.

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 an interprime number because it is at equal distance from previous prime (828649) and next prime (828673).

It is a cyclic number.

It is not a de Polignac number, because 828661 - 2¹¹ = 826613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 26731 = 828661 / (8 + 2 + 8 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13335 + ... + 13396.

It is an arithmetic number, because the mean of its divisors is an integer number (213856).

2⁸²⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

828661 is a deficient number, since it is larger than the sum of its proper divisors (26763).

828661 is a wasteful number, since it uses less digits than its factorization.

828661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26762.

The product of its digits is 4608, while the sum is 31.

The square root of 828661 is about 910.3081895710. The cubic root of 828661 is about 93.9273998046.

The spelling of 828661 in words is "eight hundred twenty-eight thousand, six hundred sixty-one".