23563649 has 4 divisors (see below), whose sum is σ = 24949764. Its totient is φ = 22177536.

The previous prime is 23563637. The next prime is 23563663. The reversal of 23563649 is 94636532.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16056049 + 7507600 = 4007^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 23563649 - 2⁴ = 23563633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (23563609) 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, 693032 + ... + 693065.

It is an arithmetic number, because the mean of its divisors is an integer number (6237441).

Almost surely, 2^23563649 is an apocalyptic number.

It is an amenable number.

23563649 is a deficient number, since it is larger than the sum of its proper divisors (1386115).

23563649 is a wasteful number, since it uses less digits than its factorization.

23563649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386114.

The product of its digits is 116640, while the sum is 38.

The square root of 23563649 is about 4854.2403113155. The cubic root of 23563649 is about 286.6910806381.

The spelling of 23563649 in words is "twenty-three million, five hundred sixty-three thousand, six hundred forty-nine".