644334014 has 4 divisors (see below), whose sum is σ = 966501024. Its totient is φ = 322167006.

The previous prime is 644334011. The next prime is 644334079. The reversal of 644334014 is 410433446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 410433446 = 2 ⋅205216723.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644334011) by changing a digit.

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 as a sum of consecutive naturals, namely, 161083502 + ... + 161083505.

It is an arithmetic number, because the mean of its divisors is an integer number (241625256).

Almost surely, 2^644334014 is an apocalyptic number.

644334014 is a deficient number, since it is larger than the sum of its proper divisors (322167010).

644334014 is a wasteful number, since it uses less digits than its factorization.

644334014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322167009.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 644334014 is about 25383.7352255337. The cubic root of 644334014 is about 863.7147826498.

The spelling of 644334014 in words is "six hundred forty-four million, three hundred thirty-four thousand, fourteen".