85711558 has 4 divisors (see below), whose sum is σ = 128567340. Its totient is φ = 42855778.

The previous prime is 85711543. The next prime is 85711567. The reversal of 85711558 is 85511758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85511758 = 2 ⋅42755879.

It is a self number, because there is not a number n which added to its sum of digits gives 85711558.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21427888 + ... + 21427891.

It is an arithmetic number, because the mean of its divisors is an integer number (32141835).

Almost surely, 2^85711558 is an apocalyptic number.

85711558 is a deficient number, since it is larger than the sum of its proper divisors (42855782).

85711558 is a wasteful number, since it uses less digits than its factorization.

85711558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42855781.

The product of its digits is 56000, while the sum is 40.

The square root of 85711558 is about 9258.0536831453. The cubic root of 85711558 is about 440.9064611714.

The spelling of 85711558 in words is "eighty-five million, seven hundred eleven thousand, five hundred fifty-eight".