23640065 has 4 divisors (see below), whose sum is σ = 28368084. Its totient is φ = 18912048.

The previous prime is 23640059. The next prime is 23640083. The reversal of 23640065 is 56004632.

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 18215824 + 5424241 = 4268^2 + 2329^2 .

It is a cyclic number.

It is not a de Polignac number, because 23640065 - 2⁴ = 23640049 is a prime.

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, 2364002 + ... + 2364011.

It is an arithmetic number, because the mean of its divisors is an integer number (7092021).

Almost surely, 2^23640065 is an apocalyptic number.

It is an amenable number.

23640065 is a deficient number, since it is larger than the sum of its proper divisors (4728019).

23640065 is an equidigital number, since it uses as much as digits as its factorization.

23640065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728018.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 23640065 is about 4862.1049968095. The cubic root of 23640065 is about 287.0006555849. Note that the first 3 decimals are identical.

Adding to 23640065 its reverse (56004632), we get a palindrome (79644697).

The spelling of 23640065 in words is "twenty-three million, six hundred forty thousand, sixty-five".