23979564 has 120 divisors (see below), whose sum is σ = 73045280. Its totient is φ = 6718464.

The previous prime is 23979563. The next prime is 23979583. The reversal of 23979564 is 46597932.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (23979563) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 219942 + ... + 220050.

Almost surely, 2^23979564 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 23979564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36522640).

23979564 is an abundant number, since it is smaller than the sum of its proper divisors (49065716).

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

23979564 is a wasteful number, since it uses less digits than its factorization.

23979564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 218 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 23979564 is about 4896.8933008592. The cubic root of 23979564 is about 288.3680191120.

The spelling of 23979564 in words is "twenty-three million, nine hundred seventy-nine thousand, five hundred sixty-four".