23451564 has 12 divisors (see below), whose sum is σ = 54720344. Its totient is φ = 7817184.

The previous prime is 23451563. The next prime is 23451569. The reversal of 23451564 is 46515432.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (23451563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977137 + ... + 977160.

Almost surely, 2^23451564 is an apocalyptic number.

It is an amenable number.

23451564 is an abundant number, since it is smaller than the sum of its proper divisors (31268780).

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

23451564 is a wasteful number, since it uses less digits than its factorization.

23451564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954304 (or 1954302 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The square root of 23451564 is about 4842.6814885970. The cubic root of 23451564 is about 286.2357910098.

Adding to 23451564 its reverse (46515432), we get a palindrome (69966996).

The spelling of 23451564 in words is "twenty-three million, four hundred fifty-one thousand, five hundred sixty-four".