85991775 has 24 divisors (see below), whose sum is σ = 142438800. Its totient is φ = 45776640.

The previous prime is 85991771. The next prime is 85991803. The reversal of 85991775 is 57719958.

It is not a de Polignac number, because 85991775 - 2² = 85991771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85991771) 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 23 ways as a sum of consecutive naturals, for example, 78129 + ... + 79221.

It is an arithmetic number, because the mean of its divisors is an integer number (5934950).

Almost surely, 2^85991775 is an apocalyptic number.

85991775 is a deficient number, since it is larger than the sum of its proper divisors (56447025).

85991775 is a wasteful number, since it uses less digits than its factorization.

85991775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155 (or 2150 counting only the distinct ones).

The product of its digits is 793800, while the sum is 51.

The square root of 85991775 is about 9273.1750226123. The cubic root of 85991775 is about 441.3864240162.

The spelling of 85991775 in words is "eighty-five million, nine hundred ninety-one thousand, seven hundred seventy-five".