23311208988 has 18 divisors (see below), whose sum is σ = 58925556144. Its totient is φ = 7770402984.

The previous prime is 23311208923. The next prime is 23311209011. The reversal of 23311208988 is 88980211332.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323766756 + ... + 323766827.

It is an arithmetic number, because the mean of its divisors is an integer number (3273642008).

Almost surely, 2^23311208988 is an apocalyptic number.

It is an amenable number.

23311208988 is an abundant number, since it is smaller than the sum of its proper divisors (35614347156).

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

23311208988 is a wasteful number, since it uses less digits than its factorization.

23311208988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647533593 (or 647533588 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 23311208988 in words is "twenty-three billion, three hundred eleven million, two hundred eight thousand, nine hundred eighty-eight".