85799999 has 4 divisors (see below), whose sum is σ = 87080664. Its totient is φ = 84519336.

The previous prime is 85799981. The next prime is 85800017. The reversal of 85799999 is 99999758.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (85799981) and next prime (85800017).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85799999 is a prime.

It is a Duffinian number.

85799999 is a modest number, since divided by 9999 gives 8579 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85799939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640232 + ... + 640365.

It is an arithmetic number, because the mean of its divisors is an integer number (21770166).

Almost surely, 2^85799999 is an apocalyptic number.

85799999 is a deficient number, since it is larger than the sum of its proper divisors (1280665).

85799999 is a wasteful number, since it uses less digits than its factorization.

85799999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280664.

The product of its digits is 16533720, while the sum is 65.

The square root of 85799999 is about 9262.8288875483. The cubic root of 85799999 is about 441.0580580114.

The spelling of 85799999 in words is "eighty-five million, seven hundred ninety-nine thousand, nine hundred ninety-nine".