644488884446 has 8 divisors (see below), whose sum is σ = 1054618174584. Its totient is φ = 292949492920.

The previous prime is 644488884439. The next prime is 644488884449.

644488884446 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644488884449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14647474625 + ... + 14647474668.

It is an arithmetic number, because the mean of its divisors is an integer number (131827271823).

Almost surely, 2^644488884446 is an apocalyptic number.

644488884446 is a deficient number, since it is larger than the sum of its proper divisors (410129290138).

644488884446 is a wasteful number, since it uses less digits than its factorization.

644488884446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29294949306.

The product of its digits is 603979776, while the sum is 68.

The spelling of 644488884446 in words is "six hundred forty-four billion, four hundred eighty-eight million, eight hundred eighty-four thousand, four hundred forty-six".