13523728 has 20 divisors (see below), whose sum is σ = 26499420. Its totient is φ = 6685184.

The previous prime is 13523717. The next prime is 13523729. The reversal of 13523728 is 82732531.

It can be written as a sum of positive squares in 2 ways, for example, as 1468944 + 12054784 = 1212^2 + 3472^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13523728.

It is not an unprimeable number, because it can be changed into a prime (13523729) 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 in 3 ways as a sum of consecutive naturals, for example, 3325 + ... + 6172.

It is an arithmetic number, because the mean of its divisors is an integer number (1324971).

Almost surely, 2^13523728 is an apocalyptic number.

It is an amenable number.

13523728 is a deficient number, since it is larger than the sum of its proper divisors (12975692).

13523728 is an equidigital number, since it uses as much as digits as its factorization.

13523728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9594 (or 9588 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 13523728 is about 3677.4621683982. The cubic root of 13523728 is about 238.2495792995.

The spelling of 13523728 in words is "thirteen million, five hundred twenty-three thousand, seven hundred twenty-eight".