23211664 has 80 divisors (see below), whose sum is σ = 55496448. Its totient is φ = 9179136.

The previous prime is 23211637. The next prime is 23211677. The reversal of 23211664 is 46611232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138909 + ... + 139075.

Almost surely, 2^23211664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23211664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27748224).

23211664 is an abundant number, since it is smaller than the sum of its proper divisors (32284784).

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

23211664 is a wasteful number, since it uses less digits than its factorization.

23211664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 266 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 23211664 is about 4817.8484824660. The cubic root of 23211664 is about 285.2564184530.

Adding to 23211664 its reverse (46611232), we get a palindrome (69822896).

The spelling of 23211664 in words is "twenty-three million, two hundred eleven thousand, six hundred sixty-four".