85657279 has 4 divisors (see below), whose sum is σ = 85867120. Its totient is φ = 85447440.

The previous prime is 85657261. The next prime is 85657283. The reversal of 85657279 is 97275658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97275658 = 2 ⋅48637829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85657279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85667279) 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, 104307 + ... + 105124.

It is an arithmetic number, because the mean of its divisors is an integer number (21466780).

Almost surely, 2^85657279 is an apocalyptic number.

85657279 is a deficient number, since it is larger than the sum of its proper divisors (209841).

85657279 is a wasteful number, since it uses less digits than its factorization.

85657279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209840.

The product of its digits is 1058400, while the sum is 49.

The square root of 85657279 is about 9255.1217712140. The cubic root of 85657279 is about 440.8133698156.

The spelling of 85657279 in words is "eighty-five million, six hundred fifty-seven thousand, two hundred seventy-nine".