13728397431 has 8 divisors (see below), whose sum is σ = 20919462784. Its totient is φ = 7844798520.

The previous prime is 13728397421. The next prime is 13728397471. The reversal of 13728397431 is 13479382731.

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

It is not a de Polignac number, because 13728397431 - 2⁹ = 13728396919 is a prime.

It is a super-2 number, since 2×13728397431² (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 (13728397421) 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, 326866585 + ... + 326866626.

It is an arithmetic number, because the mean of its divisors is an integer number (2614932848).

Almost surely, 2^13728397431 is an apocalyptic number.

13728397431 is a deficient number, since it is larger than the sum of its proper divisors (7191065353).

13728397431 is an equidigital number, since it uses as much as digits as its factorization.

13728397431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653733221.

The product of its digits is 762048, while the sum is 48.

The spelling of 13728397431 in words is "thirteen billion, seven hundred twenty-eight million, three hundred ninety-seven thousand, four hundred thirty-one".