644611014 has 64 divisors (see below), whose sum is σ = 1496102400. Its totient is φ = 205468704.

The previous prime is 644611001. The next prime is 644611139. The reversal of 644611014 is 410116446.

644611014 is a `hidden beast` number, since 6 + 44 + 611 + 0 + 1 + 4 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 165639 + ... + 169485.

It is an arithmetic number, because the mean of its divisors is an integer number (23376600).

Almost surely, 2^644611014 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644611014, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748051200).

644611014 is an abundant number, since it is smaller than the sum of its proper divisors (851491386).

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

644611014 is a wasteful number, since it uses less digits than its factorization.

644611014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994 (or 3988 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 644611014 is about 25389.1908890378. The cubic root of 644611014 is about 863.8385356067.

The spelling of 644611014 in words is "six hundred forty-four million, six hundred eleven thousand, fourteen".