285679 has 4 divisors (see below), whose sum is σ = 295560. Its totient is φ = 275800.

The previous prime is 285673. The next prime is 285697. The reversal of 285679 is 976582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 285679 - 2¹¹ = 283631 is a prime.

It is a super-2 number, since 2×285679² = 163224982082, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹¹ + 8³ + 6⁷ + 5⁵ + 7² + 9 .

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4897 + ... + 4954.

It is an arithmetic number, because the mean of its divisors is an integer number (73890).

285679 is a Friedman number, since it can be written as (9+8)*(7^5-2)-6, using all its digits and the basic arithmetic operations.

2²⁸⁵⁶⁷⁹ is an apocalyptic number.

285679 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

285679 is a deficient number, since it is larger than the sum of its proper divisors (9881).

285679 is an equidigital number, since it uses as much as digits as its factorization.

285679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9880.

The product of its digits is 30240, while the sum is 37.

The square root of 285679 is about 534.4894760423. The cubic root of 285679 is about 65.8606641136.

The spelling of 285679 in words is "two hundred eighty-five thousand, six hundred seventy-nine".