13708447729 has 4 divisors (see below), whose sum is σ = 13716269476. Its totient is φ = 13700625984.

The previous prime is 13708447717. The next prime is 13708447751. The reversal of 13708447729 is 92774480731.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2398550625 + 11309897104 = 48975^2 + 106348^2 .

It is a cyclic number.

It is not a de Polignac number, because 13708447729 - 2¹⁵ = 13708414961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13708447789) 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, 3908244 + ... + 3911749.

It is an arithmetic number, because the mean of its divisors is an integer number (3429067369).

Almost surely, 2^13708447729 is an apocalyptic number.

It is an amenable number.

13708447729 is a deficient number, since it is larger than the sum of its proper divisors (7821747).

13708447729 is an equidigital number, since it uses as much as digits as its factorization.

13708447729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7821746.

The product of its (nonzero) digits is 2370816, while the sum is 52.

The spelling of 13708447729 in words is "thirteen billion, seven hundred eight million, four hundred forty-seven thousand, seven hundred twenty-nine".