13640847729 has 8 divisors (see below), whose sum is σ = 18406927392. Its totient is φ = 8984333280.

The previous prime is 13640847721. The next prime is 13640847733. The reversal of 13640847729 is 92774804631.

13640847729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13640847729 - 2³ = 13640847721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13640847721) 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 in 7 ways as a sum of consecutive naturals, for example, 27391012 + ... + 27391509.

It is an arithmetic number, because the mean of its divisors is an integer number (2300865924).

Almost surely, 2^13640847729 is an apocalyptic number.

It is an amenable number.

13640847729 is a deficient number, since it is larger than the sum of its proper divisors (4766079663).

13640847729 is an equidigital number, since it uses as much as digits as its factorization.

13640847729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54782607.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 13640847729 in words is "thirteen billion, six hundred forty million, eight hundred forty-seven thousand, seven hundred twenty-nine".