23656140 has 72 divisors (see below), whose sum is σ = 75544560. Its totient is φ = 5975424.

The previous prime is 23656133. The next prime is 23656147. The reversal of 23656140 is 4165632.

23656140 is a `hidden beast` number, since 2 + 3 + 656 + 1 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (23656133) and next prime (23656147).

It is a super-2 number, since 2×23656140² = 1119225919399200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23656147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (1049230).

Almost surely, 2^23656140 is an apocalyptic number.

23656140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23656140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37772280).

23656140 is an abundant number, since it is smaller than the sum of its proper divisors (51888420).

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

23656140 is a wasteful number, since it uses less digits than its factorization.

23656140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951 (or 6946 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 23656140 is about 4863.7578064702. The cubic root of 23656140 is about 287.0656933392.

The spelling of 23656140 in words is "twenty-three million, six hundred fifty-six thousand, one hundred forty".