644508382 has 16 divisors (see below), whose sum is σ = 1114651872. Its totient is φ = 273772800.

The previous prime is 644508379. The next prime is 644508427. The reversal of 644508382 is 283805446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202119 + ... + 205282.

It is an arithmetic number, because the mean of its divisors is an integer number (69665742).

Almost surely, 2^644508382 is an apocalyptic number.

644508382 is a deficient number, since it is larger than the sum of its proper divisors (470143490).

644508382 is a wasteful number, since it uses less digits than its factorization.

644508382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407523.

The product of its (nonzero) digits is 184320, while the sum is 40.

The square root of 644508382 is about 25387.1696334979. The cubic root of 644508382 is about 863.7926877076.

The spelling of 644508382 in words is "six hundred forty-four million, five hundred eight thousand, three hundred eighty-two".