13728778 has 16 divisors (see below), whose sum is σ = 23834880. Its totient is φ = 5808816.

The previous prime is 13728731. The next prime is 13728791. The reversal of 13728778 is 87782731.

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 7 ways as a sum of consecutive naturals, for example, 5101 + ... + 7312.

It is an arithmetic number, because the mean of its divisors is an integer number (1489680).

Almost surely, 2^13728778 is an apocalyptic number.

13728778 is a deficient number, since it is larger than the sum of its proper divisors (10106102).

13728778 is a wasteful number, since it uses less digits than its factorization.

13728778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12501.

The product of its digits is 131712, while the sum is 43.

The square root of 13728778 is about 3705.2365646474. The cubic root of 13728778 is about 239.4476766465.

The spelling of 13728778 in words is "thirteen million, seven hundred twenty-eight thousand, seven hundred seventy-eight".