23640605 has 4 divisors (see below), whose sum is σ = 28368732. Its totient is φ = 18912480.

The previous prime is 23640581. The next prime is 23640607. The reversal of 23640605 is 50604632.

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 6285049 + 17355556 = 2507^2 + 4166^2 .

It is not a de Polignac number, because 23640605 - 2⁸ = 23640349 is a prime.

It is a super-3 number, since 3×23640605³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23640607) 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, 2364056 + ... + 2364065.

It is an arithmetic number, because the mean of its divisors is an integer number (7092183).

Almost surely, 2^23640605 is an apocalyptic number.

It is an amenable number.

23640605 is a deficient number, since it is larger than the sum of its proper divisors (4728127).

23640605 is an equidigital number, since it uses as much as digits as its factorization.

23640605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4728126.

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

The square root of 23640605 is about 4862.1605279958. The cubic root of 23640605 is about 287.0028408465.

The spelling of 23640605 in words is "twenty-three million, six hundred forty thousand, six hundred five".