23051988 has 18 divisors (see below), whose sum is σ = 58270394. Its totient is φ = 7683984.

The previous prime is 23051971. The next prime is 23051993. The reversal of 23051988 is 88915032.

It can be written as a sum of positive squares in only one way, i.e., 14653584 + 8398404 = 3828^2 + 2898^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-5 number, since 5×23051988⁵ (a number of 38 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 640333 = 23051988 / (2 + 3 + 0 + 5 + 1 + 9 + 8 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320131 + ... + 320202.

Almost surely, 2^23051988 is an apocalyptic number.

It is an amenable number.

23051988 is an abundant number, since it is smaller than the sum of its proper divisors (35218406).

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

23051988 is a wasteful number, since it uses less digits than its factorization.

23051988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640343 (or 640338 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 23051988 is about 4801.2485876072. The cubic root of 23051988 is about 284.6008076968.

The spelling of 23051988 in words is "twenty-three million, fifty-one thousand, nine hundred eighty-eight".