13728609581 has 8 divisors (see below), whose sum is σ = 14537705280. Its totient is φ = 12928167648.

The previous prime is 13728609571. The next prime is 13728609593. The reversal of 13728609581 is 18590682731.

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

It is a cyclic number.

It is not a de Polignac number, because 13728609581 - 2²² = 13724415277 is a prime.

It is a super-2 number, since 2×13728609581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13728609571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2160176 + ... + 2166521.

It is an arithmetic number, because the mean of its divisors is an integer number (1817213160).

Almost surely, 2^13728609581 is an apocalyptic number.

It is an amenable number.

13728609581 is a deficient number, since it is larger than the sum of its proper divisors (809095699).

13728609581 is a wasteful number, since it uses less digits than its factorization.

13728609581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326883.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 13728609581 in words is "thirteen billion, seven hundred twenty-eight million, six hundred nine thousand, five hundred eighty-one".