644024420446 has 32 divisors (see below), whose sum is σ = 1116186946560. Its totient is φ = 275435222400.

The previous prime is 644024420407. The next prime is 644024420467.

It is a happy number.

644024420446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644024420399 and 644024420408.

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, 987315 + ... + 1504273.

It is an arithmetic number, because the mean of its divisors is an integer number (34880842080).

Almost surely, 2^644024420446 is an apocalyptic number.

644024420446 is a deficient number, since it is larger than the sum of its proper divisors (472162526114).

644024420446 is a wasteful number, since it uses less digits than its factorization.

644024420446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520320.

The product of its (nonzero) digits is 589824, while the sum is 40.

The spelling of 644024420446 in words is "six hundred forty-four billion, twenty-four million, four hundred twenty thousand, four hundred forty-six".