13663378 has 8 divisors (see below), whose sum is σ = 20514672. Its totient is φ = 6825156.

The previous prime is 13663361. The next prime is 13663387. The reversal of 13663378 is 87336631.

13663378 is a nontrivial binomial coefficient, being equal to C(5228, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 1 + ... + 5227.

It is an arithmetic number, because the mean of its divisors is an integer number (2564334).

Almost surely, 2^13663378 is an apocalyptic number.

13663378 is the 5227-th triangular number and also the 2614-th hexagonal number.

13663378 is the 1743-rd centered nonagonal number.

13663378 is a deficient number, since it is larger than the sum of its proper divisors (6851294).

13663378 is a wasteful number, since it uses less digits than its factorization.

13663378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536.

The product of its digits is 54432, while the sum is 37.

The square root of 13663378 is about 3696.4006817443. The cubic root of 13663378 is about 239.0668510436.

It can be divided in two parts, 13663 and 378, that added together give a palindrome (14041).

The spelling of 13663378 in words is "thirteen million, six hundred sixty-three thousand, three hundred seventy-eight".