85979847 has 4 divisors (see below), whose sum is σ = 114639800. Its totient is φ = 57319896.

The previous prime is 85979843. The next prime is 85979849. The reversal of 85979847 is 74897958.

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

It is not a de Polignac number, because 85979847 - 2² = 85979843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85979843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14329972 + ... + 14329977.

It is an arithmetic number, because the mean of its divisors is an integer number (28659950).

Almost surely, 2^85979847 is an apocalyptic number.

85979847 is a deficient number, since it is larger than the sum of its proper divisors (28659953).

85979847 is a wasteful number, since it uses less digits than its factorization.

85979847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28659952.

The product of its digits is 5080320, while the sum is 57.

The square root of 85979847 is about 9272.5318548927. The cubic root of 85979847 is about 441.3660146971.

The spelling of 85979847 in words is "eighty-five million, nine hundred seventy-nine thousand, eight hundred forty-seven".