23616 has 42 divisors (see below), whose sum is σ = 69342. Its totient is φ = 7680.

The previous prime is 23609. The next prime is 23623. The reversal of 23616 is 61632.

It is a happy number.

23616 is nontrivially palindromic in base 15.

It is an interprime number because it is at equal distance from previous prime (23609) and next prime (23623).

It can be written as a sum of positive squares in only one way, i.e., 14400 + 9216 = 120^2 + 96^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556 + ... + 596.

It is an arithmetic number, because the mean of its divisors is an integer number (1651).

2²³⁶¹⁶ 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 23616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34671).

23616 is an abundant number, since it is smaller than the sum of its proper divisors (45726).

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

23616 is a wasteful number, since it uses less digits than its factorization.

23616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 46 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 23616 is about 153.6749816984. The cubic root of 23616 is about 28.6903236004.

Adding to 23616 its product of digits (216), we get a palindrome (23832).

It can be divided in two parts, 236 and 16, that added together give a palindrome (252).

The spelling of 23616 in words is "twenty-three thousand, six hundred sixteen".