85807009 has 4 divisors (see below), whose sum is σ = 86238400. Its totient is φ = 85375620.

The previous prime is 85806989. The next prime is 85807031. The reversal of 85807009 is 90070858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85807009 - 2⁷ = 85806881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85807049) 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, 215397 + ... + 215794.

It is an arithmetic number, because the mean of its divisors is an integer number (21559600).

Almost surely, 2^85807009 is an apocalyptic number.

It is an amenable number.

85807009 is a deficient number, since it is larger than the sum of its proper divisors (431391).

85807009 is a wasteful number, since it uses less digits than its factorization.

85807009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431390.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 85807009 is about 9263.2072739414. The cubic root of 85807009 is about 441.0700694054.

The spelling of 85807009 in words is "eighty-five million, eight hundred seven thousand, nine".