23664643 has 4 divisors (see below), whose sum is σ = 23732800. Its totient is φ = 23596488.

The previous prime is 23664637. The next prime is 23664647. The reversal of 23664643 is 34646632.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23664643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23664599 and 23664608.

It is not an unprimeable number, because it can be changed into a prime (23664647) 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, 33555 + ... + 34252.

It is an arithmetic number, because the mean of its divisors is an integer number (5933200).

Almost surely, 2^23664643 is an apocalyptic number.

23664643 is a deficient number, since it is larger than the sum of its proper divisors (68157).

23664643 is an equidigital number, since it uses as much as digits as its factorization.

23664643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68156.

The product of its digits is 62208, while the sum is 34.

The square root of 23664643 is about 4864.6318462963. The cubic root of 23664643 is about 287.1000836665.

The spelling of 23664643 in words is "twenty-three million, six hundred sixty-four thousand, six hundred forty-three".