85709289 has 4 divisors (see below), whose sum is σ = 114279056. Its totient is φ = 57139524.

The previous prime is 85709269. The next prime is 85709303. The reversal of 85709289 is 98290758.

It is a happy number.

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 not a de Polignac number, because 85709289 - 2¹¹ = 85707241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85709249) 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, 14284879 + ... + 14284884.

It is an arithmetic number, because the mean of its divisors is an integer number (28569764).

Almost surely, 2^85709289 is an apocalyptic number.

It is an amenable number.

85709289 is a deficient number, since it is larger than the sum of its proper divisors (28569767).

85709289 is a wasteful number, since it uses less digits than its factorization.

85709289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28569766.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 85709289 is about 9257.9311403790. The cubic root of 85709289 is about 440.9025705036.

The spelling of 85709289 in words is "eighty-five million, seven hundred nine thousand, two hundred eighty-nine".