644334324 has 12 divisors (see below), whose sum is σ = 1503446784. Its totient is φ = 214778104.

The previous prime is 644334253. The next prime is 644334331. The reversal of 644334324 is 423433446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26847252 + ... + 26847275.

It is an arithmetic number, because the mean of its divisors is an integer number (125287232).

Almost surely, 2^644334324 is an apocalyptic number.

It is an amenable number.

644334324 is an abundant number, since it is smaller than the sum of its proper divisors (859112460).

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

644334324 is a wasteful number, since it uses less digits than its factorization.

644334324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53694534 (or 53694532 counting only the distinct ones).

The product of its digits is 82944, while the sum is 33.

The square root of 644334324 is about 25383.7413318053. The cubic root of 644334324 is about 863.7149211657.

The spelling of 644334324 in words is "six hundred forty-four million, three hundred thirty-four thousand, three hundred twenty-four".