85897791 has 24 divisors (see below), whose sum is σ = 142125984. Its totient is φ = 48971520.

The previous prime is 85897783. The next prime is 85897837. The reversal of 85897791 is 19779858.

It is not a de Polignac number, because 85897791 - 2³ = 85897783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85897711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31515 + ... + 34131.

It is an arithmetic number, because the mean of its divisors is an integer number (5921916).

Almost surely, 2^85897791 is an apocalyptic number.

85897791 is a deficient number, since it is larger than the sum of its proper divisors (56228193).

85897791 is a wasteful number, since it uses less digits than its factorization.

85897791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151 (or 3148 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 85897791 is about 9268.1061172173. The cubic root of 85897791 is about 441.2255621827.

The spelling of 85897791 in words is "eighty-five million, eight hundred ninety-seven thousand, seven hundred ninety-one".