85785817 has 32 divisors (see below), whose sum is σ = 102453120. Its totient is φ = 71124480.

The previous prime is 85785811. The next prime is 85785827. The reversal of 85785817 is 71858758.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85785817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85785811) 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, 435363 + ... + 435559.

It is an arithmetic number, because the mean of its divisors is an integer number (3201660).

Almost surely, 2^85785817 is an apocalyptic number.

It is an amenable number.

85785817 is a deficient number, since it is larger than the sum of its proper divisors (16667303).

85785817 is a wasteful number, since it uses less digits than its factorization.

85785817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313.

The product of its digits is 627200, while the sum is 49.

The square root of 85785817 is about 9262.0633230399. The cubic root of 85785817 is about 441.0337556410.

The spelling of 85785817 in words is "eighty-five million, seven hundred eighty-five thousand, eight hundred seventeen".