609665 has 8 divisors (see below), whose sum is σ = 836160. Its totient is φ = 418032.

The previous prime is 609641. The next prime is 609673. The reversal of 609665 is 566906.

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 609665 - 2⁶ = 609601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8675 + ... + 8744.

It is an arithmetic number, because the mean of its divisors is an integer number (104520).

2⁶⁰⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

609665 is a deficient number, since it is larger than the sum of its proper divisors (226495).

609665 is a wasteful number, since it uses less digits than its factorization.

609665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17431.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 609665 is about 780.8104763641. The cubic root of 609665 is about 84.7937328494.

The spelling of 609665 in words is "six hundred nine thousand, six hundred sixty-five".