85672591 has 4 divisors (see below), whose sum is σ = 85728832. Its totient is φ = 85616352.

The previous prime is 85672589. The next prime is 85672597. The reversal of 85672591 is 19527658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19527658 = 2 ⋅9763829.

It is a cyclic number.

It is not a de Polignac number, because 85672591 - 2¹ = 85672589 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 (85672597) 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, 25770 + ... + 28903.

It is an arithmetic number, because the mean of its divisors is an integer number (21432208).

Almost surely, 2^85672591 is an apocalyptic number.

85672591 is a deficient number, since it is larger than the sum of its proper divisors (56241).

85672591 is a wasteful number, since it uses less digits than its factorization.

85672591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56240.

The product of its digits is 151200, while the sum is 43.

The square root of 85672591 is about 9255.9489518903. The cubic root of 85672591 is about 440.8396346867.

The spelling of 85672591 in words is "eighty-five million, six hundred seventy-two thousand, five hundred ninety-one".