85308257 has 4 divisors (see below), whose sum is σ = 85337280. Its totient is φ = 85279236.

The previous prime is 85308221. The next prime is 85308263. The reversal of 85308257 is 75280358.

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 85308257 - 2²⁴ = 68531041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85308257.

It is not an unprimeable number, because it can be changed into a prime (85308287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9533 + ... + 16170.

It is an arithmetic number, because the mean of its divisors is an integer number (21334320).

Almost surely, 2^85308257 is an apocalyptic number.

It is an amenable number.

85308257 is a deficient number, since it is larger than the sum of its proper divisors (29023).

85308257 is a wasteful number, since it uses less digits than its factorization.

85308257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29022.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 85308257 is about 9236.2469109482. The cubic root of 85308257 is about 440.2138371754.

The spelling of 85308257 in words is "eighty-five million, three hundred eight thousand, two hundred fifty-seven".