90609 has 4 divisors (see below), whose sum is σ = 120816. Its totient is φ = 60404.

The previous prime is 90599. The next prime is 90617.

90609 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90609 - 2⁷ = 90481 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15099 + ... + 15104.

It is an arithmetic number, because the mean of its divisors is an integer number (30204).

2⁹⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

90609 is a deficient number, since it is larger than the sum of its proper divisors (30207).

90609 is a wasteful number, since it uses less digits than its factorization.

90609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30206.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 90609 is about 301.0132887432. The cubic root of 90609 is about 44.9149008997.

The spelling of 90609 in words is "ninety thousand, six hundred nine".