85684581 has 8 divisors (see below), whose sum is σ = 126940160. Its totient is φ = 57123036.

The previous prime is 85684561. The next prime is 85684597. The reversal of 85684581 is 18548658.

85684581 is a `hidden beast` number, since 8 + 5 + 68 + 4 + 581 = 666.

It is not a de Polignac number, because 85684581 - 2⁹ = 85684069 is a prime.

It is a super-2 number, since 2×85684581² = 14683694842291122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85684561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586725 + ... + 1586778.

It is an arithmetic number, because the mean of its divisors is an integer number (15867520).

Almost surely, 2^85684581 is an apocalyptic number.

It is an amenable number.

85684581 is a deficient number, since it is larger than the sum of its proper divisors (41255579).

85684581 is a wasteful number, since it uses less digits than its factorization.

85684581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173512 (or 3173506 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The square root of 85684581 is about 9256.5966207889. The cubic root of 85684581 is about 440.8601991037.

The spelling of 85684581 in words is "eighty-five million, six hundred eighty-four thousand, five hundred eighty-one".