644334083 has 8 divisors (see below), whose sum is σ = 649635840. Its totient is φ = 639042120.

The previous prime is 644334079. The next prime is 644334127. The reversal of 644334083 is 380433446.

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

It is a cyclic number.

It is not a de Polignac number, because 644334083 - 2² = 644334079 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644334583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188318 + ... + 191708.

It is an arithmetic number, because the mean of its divisors is an integer number (81204480).

Almost surely, 2^644334083 is an apocalyptic number.

644334083 is a deficient number, since it is larger than the sum of its proper divisors (5301757).

644334083 is a wasteful number, since it uses less digits than its factorization.

644334083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4897.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 644334083 is about 25383.7365846717. The cubic root of 644334083 is about 863.7148134807.

The spelling of 644334083 in words is "six hundred forty-four million, three hundred thirty-four thousand, eighty-three".