23181764 has 12 divisors (see below), whose sum is σ = 40947984. Its totient is φ = 11482344.

The previous prime is 23181733. The next prime is 23181779. The reversal of 23181764 is 46718132.

It is a self number, because there is not a number n which added to its sum of digits gives 23181764.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26654 + ... + 27509.

It is an arithmetic number, because the mean of its divisors is an integer number (3412332).

Almost surely, 2^23181764 is an apocalyptic number.

It is an amenable number.

23181764 is a deficient number, since it is larger than the sum of its proper divisors (17766220).

23181764 is a wasteful number, since it uses less digits than its factorization.

23181764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54274 (or 54272 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 23181764 is about 4814.7444376623. The cubic root of 23181764 is about 285.1338819012.

Adding to 23181764 its reverse (46718132), we get a palindrome (69899896).

It can be divided in two parts, 2 and 3181764, that multiplied together give a triangular number (6363528 = T₃₅₆₇).

The spelling of 23181764 in words is "twenty-three million, one hundred eighty-one thousand, seven hundred sixty-four".