644117334 has 32 divisors (see below), whose sum is σ = 1473071616. Its totient is φ = 183933120.

The previous prime is 644117333. The next prime is 644117351. The reversal of 644117334 is 433711446.

644117334 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644117295 and 644117304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644117333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111034 + ... + 116690.

It is an arithmetic number, because the mean of its divisors is an integer number (46033488).

Almost surely, 2^644117334 is an apocalyptic number.

644117334 is an abundant number, since it is smaller than the sum of its proper divisors (828954282).

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

644117334 is a wasteful number, since it uses less digits than its factorization.

644117334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380.

The product of its digits is 24192, while the sum is 33.

The square root of 644117334 is about 25379.4667792686. The cubic root of 644117334 is about 863.6179536255.

The spelling of 644117334 in words is "six hundred forty-four million, one hundred seventeen thousand, three hundred thirty-four".