85819869 has 12 divisors (see below), whose sum is σ = 124939776. Its totient is φ = 56761992.

The previous prime is 85819861. The next prime is 85819891. The reversal of 85819869 is 96891858.

It is not a de Polignac number, because 85819869 - 2³ = 85819861 is a prime.

It is a super-2 number, since 2×85819869² = 14730099830354322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85819861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36399 + ... + 38684.

It is an arithmetic number, because the mean of its divisors is an integer number (10411648).

Almost surely, 2^85819869 is an apocalyptic number.

It is an amenable number.

85819869 is a deficient number, since it is larger than the sum of its proper divisors (39119907).

85819869 is a wasteful number, since it uses less digits than its factorization.

85819869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75216 (or 75213 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 85819869 is about 9263.9013919622. The cubic root of 85819869 is about 441.0921028726.

The spelling of 85819869 in words is "eighty-five million, eight hundred nineteen thousand, eight hundred sixty-nine".