444688889138 has 12 divisors (see below), whose sum is σ = 722290533498. Its totient is φ = 205241025600.

The previous prime is 444688889137. The next prime is 444688889171. The reversal of 444688889138 is 831988886444.

It can be written as a sum of positive squares in 3 ways, for example, as 324094519849 + 120594369289 = 569293^2 + 347267^2 .

It is not an unprimeable number, because it can be changed into a prime (444688889137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 657823463 + ... + 657824138.

Almost surely, 2^444688889138 is an apocalyptic number.

444688889138 is a deficient number, since it is larger than the sum of its proper divisors (277601644360).

444688889138 is a wasteful number, since it uses less digits than its factorization.

444688889138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315647629 (or 1315647616 counting only the distinct ones).

The product of its digits is 339738624, while the sum is 71.

The spelling of 444688889138 in words is "four hundred forty-four billion, six hundred eighty-eight million, eight hundred eighty-nine thousand, one hundred thirty-eight".