85591658 has 4 divisors (see below), whose sum is σ = 128387490. Its totient is φ = 42795828.

The previous prime is 85591643. The next prime is 85591687. The reversal of 85591658 is 85619558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85619558 = 2 ⋅42809779.

It can be written as a sum of positive squares in only one way, i.e., 80694289 + 4897369 = 8983^2 + 2213^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21397913 + ... + 21397916.

Almost surely, 2^85591658 is an apocalyptic number.

85591658 is a deficient number, since it is larger than the sum of its proper divisors (42795832).

85591658 is a wasteful number, since it uses less digits than its factorization.

85591658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42795831.

The product of its digits is 432000, while the sum is 47.

The square root of 85591658 is about 9251.5759738544. The cubic root of 85591658 is about 440.7007738035.

The spelling of 85591658 in words is "eighty-five million, five hundred ninety-one thousand, six hundred fifty-eight".