85599999 has 6 divisors (see below), whose sum is σ = 123644456. Its totient is φ = 57066660.

The previous prime is 85599991. The next prime is 85600027. The reversal of 85599999 is 99999558.

It is not a de Polignac number, because 85599999 - 2³ = 85599991 is a prime.

It is a Duffinian number.

85599999 is a modest number, since divided by 9999 gives 8559 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85599991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4755547 + ... + 4755564.

Almost surely, 2^85599999 is an apocalyptic number.

85599999 is a deficient number, since it is larger than the sum of its proper divisors (38044457).

85599999 is a wasteful number, since it uses less digits than its factorization.

85599999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9511117 (or 9511114 counting only the distinct ones).

The product of its digits is 11809800, while the sum is 63.

The square root of 85599999 is about 9252.0267509341. The cubic root of 85599999 is about 440.7150889281.

The spelling of 85599999 in words is "eighty-five million, five hundred ninety-nine thousand, nine hundred ninety-nine".