23613440 has 52 divisors (see below), whose sum is σ = 56714484. Its totient is φ = 9437184.

The previous prime is 23613427. The next prime is 23613449. The reversal of 23613440 is 4431632.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13778944 + 9834496 = 3712^2 + 3136^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23613449) 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, 19904 + ... + 21056.

Almost surely, 2^23613440 is an apocalyptic number.

23613440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23613440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28357242).

23613440 is an abundant number, since it is smaller than the sum of its proper divisors (33101044).

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

23613440 is an equidigital number, since it uses as much as digits as its factorization.

23613440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 23613440 is about 4859.3662138184. The cubic root of 23613440 is about 286.8928687550.

The spelling of 23613440 in words is "twenty-three million, six hundred thirteen thousand, four hundred forty".