85716581 has 16 divisors (see below), whose sum is σ = 93657600. Its totient is φ = 78148800.

The previous prime is 85716577. The next prime is 85716583. The reversal of 85716581 is 18561758.

It is a cyclic number.

It is not a de Polignac number, because 85716581 - 2² = 85716577 is a prime.

It is a super-2 number, since 2×85716581² = 14694664516659122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85716583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158171 + ... + 158711.

It is an arithmetic number, because the mean of its divisors is an integer number (5853600).

Almost surely, 2^85716581 is an apocalyptic number.

It is an amenable number.

85716581 is a deficient number, since it is larger than the sum of its proper divisors (7941019).

85716581 is a wasteful number, since it uses less digits than its factorization.

85716581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its digits is 67200, while the sum is 41.

The square root of 85716581 is about 9258.3249564919. The cubic root of 85716581 is about 440.9150738951.

The spelling of 85716581 in words is "eighty-five million, seven hundred sixteen thousand, five hundred eighty-one".