23640631 has 8 divisors (see below), whose sum is σ = 27889664. Its totient is φ = 19609560.

The previous prime is 23640613. The next prime is 23640637. The reversal of 23640631 is 13604632.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23640631 - 2¹⁵ = 23607863 is a prime.

It is a super-2 number, since 2×23640631² = 1117758868156322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23640596 and 23640605.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54255 + ... + 54688.

It is an arithmetic number, because the mean of its divisors is an integer number (3486208).

Almost surely, 2^23640631 is an apocalyptic number.

23640631 is a deficient number, since it is larger than the sum of its proper divisors (4249033).

23640631 is a wasteful number, since it uses less digits than its factorization.

23640631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108981.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 23640631 is about 4862.1632017035. The cubic root of 23640631 is about 287.0029460619.

The spelling of 23640631 in words is "twenty-three million, six hundred forty thousand, six hundred thirty-one".