13440747644 has 12 divisors (see below), whose sum is σ = 23523751944. Its totient is φ = 6719675664.

The previous prime is 13440747643. The next prime is 13440747667. The reversal of 13440747644 is 44674704431.

It is a junction number, because it is equal to n+sod(n) for n = 13440747595 and 13440747604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440747643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129959 + ... + 209214.

It is an arithmetic number, because the mean of its divisors is an integer number (1960312662).

Almost surely, 2^13440747644 is an apocalyptic number.

It is an amenable number.

13440747644 is a deficient number, since it is larger than the sum of its proper divisors (10083004300).

13440747644 is a wasteful number, since it uses less digits than its factorization.

13440747644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349084 (or 349082 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 44.

The spelling of 13440747644 in words is "thirteen billion, four hundred forty million, seven hundred forty-seven thousand, six hundred forty-four".