12531328 has 32 divisors (see below), whose sum is σ = 25508160. Its totient is φ = 6129408.

The previous prime is 12531313. The next prime is 12531331. The reversal of 12531328 is 82313521.

12531328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4975 + ... + 7057.

It is an arithmetic number, because the mean of its divisors is an integer number (797130).

Almost surely, 2^12531328 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 12531328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12754080).

12531328 is an abundant number, since it is smaller than the sum of its proper divisors (12976832).

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

12531328 is an equidigital number, since it uses as much as digits as its factorization.

12531328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144 (or 2132 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 12531328 is about 3539.9615817124. The cubic root of 12531328 is about 232.2731621939.

Adding to 12531328 its reverse (82313521), we get a palindrome (94844849).

The spelling of 12531328 in words is "twelve million, five hundred thirty-one thousand, three hundred twenty-eight".