8564985 has 60 divisors (see below), whose sum is σ = 17586660. Its totient is φ = 3833280.

The previous prime is 8564981. The next prime is 8564987. The reversal of 8564985 is 5894658.

8564985 is a `hidden beast` number, since 8 + 564 + 9 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2108304 + 6456681 = 1452^2 + 2541^2 .

It is not a de Polignac number, because 8564985 - 2² = 8564981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an Ulam number.

Its product of digits (345600) is a multiple of the sum of its prime divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 8564985.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8564981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 658839 + ... + 658851.

It is an arithmetic number, because the mean of its divisors is an integer number (293111).

Almost surely, 2^8564985 is an apocalyptic number.

It is an amenable number.

8564985 is an abundant number, since it is smaller than the sum of its proper divisors (9021675).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8564985 is a wasteful number, since it uses less digits than its factorization.

8564985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 32 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 8564985 is about 2926.5995626324. The cubic root of 8564985 is about 204.6015261766.

The spelling of 8564985 in words is "eight million, five hundred sixty-four thousand, nine hundred eighty-five".