53664609 has 4 divisors (see below), whose sum is σ = 71552816. Its totient is φ = 35776404.

The previous prime is 53664599. The next prime is 53664617. The reversal of 53664609 is 90646635.

It is a happy number.

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 not a de Polignac number, because 53664609 - 2⁴ = 53664593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53664619) 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, 8944099 + ... + 8944104.

It is an arithmetic number, because the mean of its divisors is an integer number (17888204).

Almost surely, 2^53664609 is an apocalyptic number.

It is an amenable number.

53664609 is a deficient number, since it is larger than the sum of its proper divisors (17888207).

53664609 is a wasteful number, since it uses less digits than its factorization.

53664609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17888206.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 53664609 is about 7325.6132166529. The cubic root of 53664609 is about 377.1921593072.

The spelling of 53664609 in words is "fifty-three million, six hundred sixty-four thousand, six hundred nine".