85679 has 4 divisors (see below), whose sum is σ = 93480. Its totient is φ = 77880.

The previous prime is 85669. The next prime is 85691. The reversal of 85679 is 97658.

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

It is not a de Polignac number, because 85679 - 2¹⁶ = 20143 is a prime.

It is a d-powerful number, because it can be written as 8⁵ + 5⁵ + 6⁶ + 7⁴ + 9³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85619) 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, 3884 + ... + 3905.

It is an arithmetic number, because the mean of its divisors is an integer number (23370).

2⁸⁵⁶⁷⁹ is an apocalyptic number.

85679 is a deficient number, since it is larger than the sum of its proper divisors (7801).

85679 is a wasteful number, since it uses less digits than its factorization.

85679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800.

The product of its digits is 15120, while the sum is 35.

The square root of 85679 is about 292.7097538518. The cubic root of 85679 is about 44.0850627198.

The spelling of 85679 in words is "eighty-five thousand, six hundred seventy-nine".