85811789 has 24 divisors (see below), whose sum is σ = 103229280. Its totient is φ = 71082144.

The previous prime is 85811777. The next prime is 85811849. The reversal of 85811789 is 98711858.

It is not a de Polignac number, because 85811789 - 2²⁰ = 84763213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85811749) 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 23 ways as a sum of consecutive naturals, for example, 292727 + ... + 293019.

It is an arithmetic number, because the mean of its divisors is an integer number (4301220).

Almost surely, 2^85811789 is an apocalyptic number.

It is an amenable number.

85811789 is a deficient number, since it is larger than the sum of its proper divisors (17417491).

85811789 is a wasteful number, since it uses less digits than its factorization.

85811789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 482 counting only the distinct ones).

The product of its digits is 161280, while the sum is 47.

The square root of 85811789 is about 9263.4652803365. The cubic root of 85811789 is about 441.0782593960.

The spelling of 85811789 in words is "eighty-five million, eight hundred eleven thousand, seven hundred eighty-nine".