644530014 has 16 divisors (see below), whose sum is σ = 1432289040. Its totient is φ = 214843320.

The previous prime is 644530013. The next prime is 644530037. The reversal of 644530014 is 410035446.

644530014 is a `hidden beast` number, since 644 + 5 + 3 + 0 + 0 + 14 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 644530014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644530013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5967817 + ... + 5967924.

It is an arithmetic number, because the mean of its divisors is an integer number (89518065).

Almost surely, 2^644530014 is an apocalyptic number.

644530014 is an abundant number, since it is smaller than the sum of its proper divisors (787759026).

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

644530014 is a wasteful number, since it uses less digits than its factorization.

644530014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11935752 (or 11935746 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 644530014 is about 25387.5956719024. The cubic root of 644530014 is about 863.8023515873.

The spelling of 644530014 in words is "six hundred forty-four million, five hundred thirty thousand, fourteen".