85218589 has 8 divisors (see below), whose sum is σ = 86065272. Its totient is φ = 84376320.

The previous prime is 85218583. The next prime is 85218599. The reversal of 85218589 is 98581258.

It can be written as a sum of positive squares in 4 ways, for example, as 13816089 + 71402500 = 3717^2 + 8450^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 85218589 - 2⁷ = 85218461 is a prime.

It is a super-3 number, since 3×85218589³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85218583) 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, 47737 + ... + 49489.

It is an arithmetic number, because the mean of its divisors is an integer number (10758159).

Almost surely, 2^85218589 is an apocalyptic number.

It is an amenable number.

85218589 is a deficient number, since it is larger than the sum of its proper divisors (846683).

85218589 is a wasteful number, since it uses less digits than its factorization.

85218589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207.

The product of its digits is 230400, while the sum is 46.

The square root of 85218589 is about 9231.3914985770. The cubic root of 85218589 is about 440.0595460045.

The spelling of 85218589 in words is "eighty-five million, two hundred eighteen thousand, five hundred eighty-nine".