23681649 has 4 divisors (see below), whose sum is σ = 31575536. Its totient is φ = 15787764.

The previous prime is 23681633. The next prime is 23681653. The reversal of 23681649 is 94618632.

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 23681649 - 2⁴ = 23681633 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 (23681689) 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, 3946939 + ... + 3946944.

It is an arithmetic number, because the mean of its divisors is an integer number (7893884).

Almost surely, 2^23681649 is an apocalyptic number.

It is an amenable number.

23681649 is a deficient number, since it is larger than the sum of its proper divisors (7893887).

23681649 is an equidigital number, since it uses as much as digits as its factorization.

23681649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893886.

The product of its digits is 62208, while the sum is 39.

The square root of 23681649 is about 4866.3794549953. The cubic root of 23681649 is about 287.1688396153.

The spelling of 23681649 in words is "twenty-three million, six hundred eighty-one thousand, six hundred forty-nine".