85639799 has 12 divisors (see below), whose sum is σ = 99963864. Its totient is φ = 73153584.

The previous prime is 85639777. The next prime is 85639811. The reversal of 85639799 is 99793658.

It is not a de Polignac number, because 85639799 - 2²⁰ = 84591223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85636799) 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, 12197 + ... + 17889.

It is an arithmetic number, because the mean of its divisors is an integer number (8330322).

Almost surely, 2^85639799 is an apocalyptic number.

85639799 is a deficient number, since it is larger than the sum of its proper divisors (14324065).

85639799 is a wasteful number, since it uses less digits than its factorization.

85639799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014 (or 6007 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 56.

The square root of 85639799 is about 9254.1773810534. The cubic root of 85639799 is about 440.7833823197.

The spelling of 85639799 in words is "eighty-five million, six hundred thirty-nine thousand, seven hundred ninety-nine".