13728478 has 4 divisors (see below), whose sum is σ = 20592720. Its totient is φ = 6864238.

The previous prime is 13728461. The next prime is 13728479. The reversal of 13728478 is 87482731.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×13728478² = 376942216392968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 13728478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13728479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3432118 + ... + 3432121.

It is an arithmetic number, because the mean of its divisors is an integer number (5148180).

Almost surely, 2^13728478 is an apocalyptic number.

13728478 is a deficient number, since it is larger than the sum of its proper divisors (6864242).

13728478 is an equidigital number, since it uses as much as digits as its factorization.

13728478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6864241.

The product of its digits is 75264, while the sum is 40.

The square root of 13728478 is about 3705.1960811811. The cubic root of 13728478 is about 239.4459325042.

The spelling of 13728478 in words is "thirteen million, seven hundred twenty-eight thousand, four hundred seventy-eight".