13381664 has 12 divisors (see below), whose sum is σ = 26345214. Its totient is φ = 6690816.

The previous prime is 13381663. The next prime is 13381691. The reversal of 13381664 is 46618331.

It can be written as a sum of positive squares in only one way, i.e., 11155600 + 2226064 = 3340^2 + 1492^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 418177 = 13381664 / (1 + 3 + 3 + 8 + 1 + 6 + 6 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 13381664.

It is not an unprimeable number, because it can be changed into a prime (13381663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209057 + ... + 209120.

Almost surely, 2^13381664 is an apocalyptic number.

It is an amenable number.

13381664 is a deficient number, since it is larger than the sum of its proper divisors (12963550).

13381664 is an equidigital number, since it uses as much as digits as its factorization.

13381664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418187 (or 418179 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 13381664 is about 3658.0956794485. The cubic root of 13381664 is about 237.4123865200.

Adding to 13381664 its reverse (46618331), we get a palindrome (59999995).

The spelling of 13381664 in words is "thirteen million, three hundred eighty-one thousand, six hundred sixty-four".