644450030 has 64 divisors (see below), whose sum is σ = 1363557888. Its totient is φ = 214704000.

The previous prime is 644450021. The next prime is 644450033. The reversal of 644450030 is 30054446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644450033) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 755084 + ... + 755936.

It is an arithmetic number, because the mean of its divisors is an integer number (21305592).

Almost surely, 2^644450030 is an apocalyptic number.

644450030 is an abundant number, since it is smaller than the sum of its proper divisors (719107858).

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

644450030 is a wasteful number, since it uses less digits than its factorization.

644450030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 644450030 is about 25386.0203655476. The cubic root of 644450030 is about 863.7666184567.

The spelling of 644450030 in words is "six hundred forty-four million, four hundred fifty thousand, thirty".