13664388 has 24 divisors (see below), whose sum is σ = 31953600. Its totient is φ = 4544800.

The previous prime is 13664353. The next prime is 13664389. The reversal of 13664388 is 88346631.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (13664389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6238 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (1331400).

Almost surely, 2^13664388 is an apocalyptic number.

It is an amenable number.

13664388 is an abundant number, since it is smaller than the sum of its proper divisors (18289212).

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

13664388 is a wasteful number, since it uses less digits than its factorization.

13664388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2505 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 13664388 is about 3696.5372986080. The cubic root of 13664388 is about 239.0727415237.

The spelling of 13664388 in words is "thirteen million, six hundred sixty-four thousand, three hundred eighty-eight".