85785791 has 32 divisors (see below), whose sum is σ = 116702208. Its totient is φ = 61079040.

The previous prime is 85785787. The next prime is 85785793. The reversal of 85785791 is 19758758.

It is a cyclic number.

It is not a de Polignac number, because 85785791 - 2² = 85785787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85785793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34376 + ... + 36786.

It is an arithmetic number, because the mean of its divisors is an integer number (3646944).

Almost surely, 2^85785791 is an apocalyptic number.

85785791 is a deficient number, since it is larger than the sum of its proper divisors (30916417).

85785791 is a wasteful number, since it uses less digits than its factorization.

85785791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471.

The product of its digits is 705600, while the sum is 50.

The square root of 85785791 is about 9262.0619194648. The cubic root of 85785791 is about 441.0337110848.

The spelling of 85785791 in words is "eighty-five million, seven hundred eighty-five thousand, seven hundred ninety-one".