23656643 has 4 divisors (see below), whose sum is σ = 23710488. Its totient is φ = 23602800.

The previous prime is 23656637. The next prime is 23656657. The reversal of 23656643 is 34665632.

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

It is a cyclic number.

It is not a de Polignac number, because 23656643 - 2¹⁶ = 23591107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23656343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26258 + ... + 27143.

It is an arithmetic number, because the mean of its divisors is an integer number (5927622).

Almost surely, 2^23656643 is an apocalyptic number.

23656643 is a deficient number, since it is larger than the sum of its proper divisors (53845).

23656643 is an equidigital number, since it uses as much as digits as its factorization.

23656643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53844.

The product of its digits is 77760, while the sum is 35.

The square root of 23656643 is about 4863.8095151846. The cubic root of 23656643 is about 287.0677279487.

The spelling of 23656643 in words is "twenty-three million, six hundred fifty-six thousand, six hundred forty-three".