13428708691 has 4 divisors (see below), whose sum is σ = 13437357192. Its totient is φ = 13420060192.

The previous prime is 13428708661. The next prime is 13428708751. The reversal of 13428708691 is 19680782431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19680782431 = 15959 ⋅1233209.

It is a cyclic number.

It is not a de Polignac number, because 13428708691 - 2⁹ = 13428708179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13428708661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4321921 + ... + 4325026.

It is an arithmetic number, because the mean of its divisors is an integer number (3359339298).

Almost surely, 2^13428708691 is an apocalyptic number.

13428708691 is a deficient number, since it is larger than the sum of its proper divisors (8648501).

13428708691 is an equidigital number, since it uses as much as digits as its factorization.

13428708691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8648500.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 13428708691 in words is "thirteen billion, four hundred twenty-eight million, seven hundred eight thousand, six hundred ninety-one".