13491328 has 16 divisors (see below), whose sum is σ = 26877510. Its totient is φ = 6745600.

The previous prime is 13491323. The next prime is 13491341. The reversal of 13491328 is 82319431.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 7744 = 3672^2 + 88^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 13491328.

It is not an unprimeable number, because it can be changed into a prime (13491323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52573 + ... + 52828.

Almost surely, 2^13491328 is an apocalyptic number.

It is an amenable number.

13491328 is a deficient number, since it is larger than the sum of its proper divisors (13386182).

13491328 is an equidigital number, since it uses as much as digits as its factorization.

13491328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105415 (or 105403 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 13491328 is about 3673.0543148720. The cubic root of 13491328 is about 238.0591619042.

The spelling of 13491328 in words is "thirteen million, four hundred ninety-one thousand, three hundred twenty-eight".