23991552 has 180 divisors, whose sum is σ = 77907060. Its totient is φ = 7299072.

The previous prime is 23991493. The next prime is 23991557. The reversal of 23991552 is 25519932.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4064256 + 19927296 = 2016^2 + 4464^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23991557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 269524 + ... + 269612.

It is an arithmetic number, because the mean of its divisors is an integer number (432817).

Almost surely, 2^23991552 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 23991552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38953530).

23991552 is an abundant number, since it is smaller than the sum of its proper divisors (53915508).

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

23991552 is an equidigital number, since it uses as much as digits as its factorization.

23991552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 107 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 23991552 is about 4898.1171892881. The cubic root of 23991552 is about 288.4160652997.

The spelling of 23991552 in words is "twenty-three million, nine hundred ninety-one thousand, five hundred fifty-two".