13778216 has 16 divisors (see below), whose sum is σ = 25874100. Its totient is φ = 6878464.

The previous prime is 13778213. The next prime is 13778221. The reversal of 13778216 is 61287731.

It can be written as a sum of positive squares in 2 ways, for example, as 9897316 + 3880900 = 3146^2 + 1970^2 .

It is a super-2 number, since 2×13778216² = 379678472285312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13778213) 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, 8096 + ... + 9648.

Almost surely, 2^13778216 is an apocalyptic number.

It is an amenable number.

13778216 is a deficient number, since it is larger than the sum of its proper divisors (12095884).

13778216 is a wasteful number, since it uses less digits than its factorization.

13778216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668 (or 2664 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 13778216 is about 3711.9019383599. The cubic root of 13778216 is about 239.7347532550.

The spelling of 13778216 in words is "thirteen million, seven hundred seventy-eight thousand, two hundred sixteen".