8640609 has 8 divisors (see below), whose sum is σ = 11716320. Its totient is φ = 5662656.

The previous prime is 8640601. The next prime is 8640679. The reversal of 8640609 is 9060468.

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

It is not a de Polignac number, because 8640609 - 2³ = 8640601 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 8640609.

It is not an unprimeable number, because it can be changed into a prime (8640601) 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, 24232 + ... + 24585.

It is an arithmetic number, because the mean of its divisors is an integer number (1464540).

Almost surely, 2^8640609 is an apocalyptic number.

It is an amenable number.

8640609 is a deficient number, since it is larger than the sum of its proper divisors (3075711).

8640609 is a wasteful number, since it uses less digits than its factorization.

8640609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48879.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 8640609 is about 2939.4912825181. The cubic root of 8640609 is about 205.2019346701.

The spelling of 8640609 in words is "eight million, six hundred forty thousand, six hundred nine".