23640990 has 16 divisors (see below), whose sum is σ = 56738448. Its totient is φ = 6304256.

The previous prime is 23640989. The next prime is 23641019. The reversal of 23640990 is 9904632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393987 + ... + 394046.

It is an arithmetic number, because the mean of its divisors is an integer number (3546153).

Almost surely, 2^23640990 is an apocalyptic number.

23640990 is an abundant number, since it is smaller than the sum of its proper divisors (33097458).

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

23640990 is a wasteful number, since it uses less digits than its factorization.

23640990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788043.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 23640990 is about 4862.2001192876. The cubic root of 23640990 is about 287.0043988367.

The spelling of 23640990 in words is "twenty-three million, six hundred forty thousand, nine hundred ninety".