8640205 has 16 divisors (see below), whose sum is σ = 12127104. Its totient is φ = 5785920.

The previous prime is 8640197. The next prime is 8640211. The reversal of 8640205 is 5020468.

It is not a de Polignac number, because 8640205 - 2³ = 8640197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8640205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1366 + ... + 4375.

It is an arithmetic number, because the mean of its divisors is an integer number (757944).

Almost surely, 2^8640205 is an apocalyptic number.

It is an amenable number.

8640205 is a deficient number, since it is larger than the sum of its proper divisors (3486899).

8640205 is a wasteful number, since it uses less digits than its factorization.

8640205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 8640205 is about 2939.4225623411. The cubic root of 8640205 is about 205.1987364822.

The spelling of 8640205 in words is "eight million, six hundred forty thousand, two hundred five".