19644330444 has 24 divisors (see below), whose sum is σ = 46588195248. Its totient is φ = 6440763840.

The previous prime is 19644330443. The next prime is 19644330457. The reversal of 19644330444 is 44403344691.

It is a junction number, because it is equal to n+sod(n) for n = 19644330396 and 19644330405.

It is not an unprimeable number, because it can be changed into a prime (19644330443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13417527 + ... + 13418990.

It is an arithmetic number, because the mean of its divisors is an integer number (1941174802).

Almost surely, 2^19644330444 is an apocalyptic number.

It is an amenable number.

19644330444 is an abundant number, since it is smaller than the sum of its proper divisors (26943864804).

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

19644330444 is a wasteful number, since it uses less digits than its factorization.

19644330444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26836585 (or 26836583 counting only the distinct ones).

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

The spelling of 19644330444 in words is "nineteen billion, six hundred forty-four million, three hundred thirty thousand, four hundred forty-four".