644051014 has 16 divisors (see below), whose sum is σ = 1010318688. Its totient is φ = 307340352.

The previous prime is 644051003. The next prime is 644051029. The reversal of 644051014 is 410150446.

It is a self number, because there is not a number n which added to its sum of digits gives 644051014.

It is a congruent number.

It is an unprimeable number.

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, 5704 + ... + 36340.

It is an arithmetic number, because the mean of its divisors is an integer number (63144918).

Almost surely, 2^644051014 is an apocalyptic number.

644051014 is a deficient number, since it is larger than the sum of its proper divisors (366267674).

644051014 is a wasteful number, since it uses less digits than its factorization.

644051014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31119.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 644051014 is about 25378.1601776015. The cubic root of 644051014 is about 863.5883124895.

The spelling of 644051014 in words is "six hundred forty-four million, fifty-one thousand, fourteen".