23644540 has 24 divisors (see below), whose sum is σ = 49785120. Its totient is φ = 9432768.

The previous prime is 23644513. The next prime is 23644549. The reversal of 23644540 is 4544632.

It is a junction number, because it is equal to n+sod(n) for n = 23644499 and 23644508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23644549) 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, 7434 + ... + 10126.

It is an arithmetic number, because the mean of its divisors is an integer number (2074380).

Almost surely, 2^23644540 is an apocalyptic number.

23644540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23644540 is an abundant number, since it is smaller than the sum of its proper divisors (26140580).

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

23644540 is a wasteful number, since it uses less digits than its factorization.

23644540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141 (or 3139 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 23644540 is about 4862.5651666584. The cubic root of 23644540 is about 287.0187639235.

The spelling of 23644540 in words is "twenty-three million, six hundred forty-four thousand, five hundred forty".