23640636 has 24 divisors (see below), whose sum is σ = 58065280. Its totient is φ = 7465392.

The previous prime is 23640613. The next prime is 23640637. The reversal of 23640636 is 63604632.

23640636 = T₄₈₀ + T₄₈₁ + ... + T₆₃₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23640637) 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 7 ways as a sum of consecutive naturals, for example, 51616 + ... + 52071.

Almost surely, 2^23640636 is an apocalyptic number.

It is an amenable number.

23640636 is an abundant number, since it is smaller than the sum of its proper divisors (34424644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23640636 is a wasteful number, since it uses less digits than its factorization.

23640636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103713 (or 103711 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 23640636 is about 4862.1637158779. The cubic root of 23640636 is about 287.0029662957.

The spelling of 23640636 in words is "twenty-three million, six hundred forty thousand, six hundred thirty-six".