13239442644 has 48 divisors (see below), whose sum is σ = 31331325312. Its totient is φ = 4350454272.

The previous prime is 13239442639. The next prime is 13239442651. The reversal of 13239442644 is 44624493231.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13239442596 and 13239442605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3355737 + ... + 3359679.

It is an arithmetic number, because the mean of its divisors is an integer number (652735944).

Almost surely, 2^13239442644 is an apocalyptic number.

It is an amenable number.

13239442644 is an abundant number, since it is smaller than the sum of its proper divisors (18091882668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13239442644 is a wasteful number, since it uses less digits than its factorization.

13239442644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7856 (or 7854 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The spelling of 13239442644 in words is "thirteen billion, two hundred thirty-nine million, four hundred forty-two thousand, six hundred forty-four".