85439257 has 16 divisors (see below), whose sum is σ = 92160000. Its totient is φ = 78963984.

The previous prime is 85439251. The next prime is 85439281. The reversal of 85439257 is 75293458.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85439257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85439251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222888 + ... + 223270.

It is an arithmetic number, because the mean of its divisors is an integer number (5760000).

Almost surely, 2^85439257 is an apocalyptic number.

It is an amenable number.

85439257 is a deficient number, since it is larger than the sum of its proper divisors (6720743).

85439257 is a wasteful number, since it uses less digits than its factorization.

85439257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its digits is 302400, while the sum is 43.

The square root of 85439257 is about 9243.3358156025. The cubic root of 85439257 is about 440.4390538245.

The spelling of 85439257 in words is "eighty-five million, four hundred thirty-nine thousand, two hundred fifty-seven".