23311988 has 24 divisors (see below), whose sum is σ = 46929792. Its totient is φ = 9925344.

The previous prime is 23311987. The next prime is 23311991. The reversal of 23311988 is 88911332.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23311987) 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, 1745 + ... + 7047.

It is an arithmetic number, because the mean of its divisors is an integer number (1955408).

Almost surely, 2^23311988 is an apocalyptic number.

23311988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

23311988 is an abundant number, since it is smaller than the sum of its proper divisors (23617804).

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

23311988 is a wasteful number, since it uses less digits than its factorization.

23311988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471 (or 5469 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 23311988 is about 4828.2489579557. The cubic root of 23311988 is about 285.6668002513. Note that the first 3 decimals are identical.

It can be divided in two parts, 233 and 11988, that added together give a palindrome (12221).

The spelling of 23311988 in words is "twenty-three million, three hundred eleven thousand, nine hundred eighty-eight".