85684565 has 8 divisors (see below), whose sum is σ = 104507448. Its totient is φ = 67423680.

The previous prime is 85684561. The next prime is 85684597. The reversal of 85684565 is 56548658.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 786769 + 84897796 = 887^2 + 9214^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85684565 - 2² = 85684561 is a prime.

It is a Duffinian number.

It is a Curzon 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, 140162 + ... + 140771.

It is an arithmetic number, because the mean of its divisors is an integer number (13063431).

Almost surely, 2^85684565 is an apocalyptic number.

It is an amenable number.

85684565 is a deficient number, since it is larger than the sum of its proper divisors (18822883).

85684565 is a wasteful number, since it uses less digits than its factorization.

85684565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280999.

The product of its digits is 1152000, while the sum is 47.

The square root of 85684565 is about 9256.5957565403. The cubic root of 85684565 is about 440.8601716628.

The spelling of 85684565 in words is "eighty-five million, six hundred eighty-four thousand, five hundred sixty-five".