85979865 has 16 divisors (see below), whose sum is σ = 143549568. Its totient is φ = 43862016.

The previous prime is 85979849. The next prime is 85979869. The reversal of 85979865 is 56897958.

It is not a de Polignac number, because 85979865 - 2⁴ = 85979849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85979869) 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 15 ways as a sum of consecutive naturals, for example, 124264 + ... + 124953.

It is an arithmetic number, because the mean of its divisors is an integer number (8971848).

Almost surely, 2^85979865 is an apocalyptic number.

It is an amenable number.

85979865 is a deficient number, since it is larger than the sum of its proper divisors (57569703).

85979865 is a wasteful number, since it uses less digits than its factorization.

85979865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249248.

The product of its digits is 5443200, while the sum is 57.

The square root of 85979865 is about 9272.5328255013. The cubic root of 85979865 is about 441.3660454973.

The spelling of 85979865 in words is "eighty-five million, nine hundred seventy-nine thousand, eight hundred sixty-five".