23664505 has 4 divisors (see below), whose sum is σ = 28397412. Its totient is φ = 18931600.

The previous prime is 23664499. The next prime is 23664517. The reversal of 23664505 is 50546632.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6985449 + 16679056 = 2643^2 + 4084^2 .

It is not a de Polignac number, because 23664505 - 2⁹ = 23663993 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2366446 + ... + 2366455.

It is an arithmetic number, because the mean of its divisors is an integer number (7099353).

Almost surely, 2^23664505 is an apocalyptic number.

It is an amenable number.

23664505 is a deficient number, since it is larger than the sum of its proper divisors (4732907).

23664505 is an equidigital number, since it uses as much as digits as its factorization.

23664505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732906.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 23664505 is about 4864.6176622629. The cubic root of 23664505 is about 287.0995255922.

The spelling of 23664505 in words is "twenty-three million, six hundred sixty-four thousand, five hundred five".