13728396646 has 4 divisors (see below), whose sum is σ = 20592594972. Its totient is φ = 6864198322.

The previous prime is 13728396641. The next prime is 13728396659. The reversal of 13728396646 is 64669382731.

13728396646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64669382731 = 45127 ⋅1433053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13728396641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3432099160 + ... + 3432099163.

It is an arithmetic number, because the mean of its divisors is an integer number (5148148743).

Almost surely, 2^13728396646 is an apocalyptic number.

13728396646 is a deficient number, since it is larger than the sum of its proper divisors (6864198326).

13728396646 is an equidigital number, since it uses as much as digits as its factorization.

13728396646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6864198325.

The product of its digits is 7838208, while the sum is 55.

The spelling of 13728396646 in words is "thirteen billion, seven hundred twenty-eight million, three hundred ninety-six thousand, six hundred forty-six".