644433134 has 8 divisors (see below), whose sum is σ = 967821048. Its totient is φ = 321826120.

The previous prime is 644433109. The next prime is 644433137. The reversal of 644433134 is 431334446.

644433134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 644433134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644433137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193157 + ... + 196464.

It is an arithmetic number, because the mean of its divisors is an integer number (120977631).

Almost surely, 2^644433134 is an apocalyptic number.

644433134 is a deficient number, since it is larger than the sum of its proper divisors (323387914).

644433134 is a wasteful number, since it uses less digits than its factorization.

644433134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390450.

The product of its digits is 41472, while the sum is 32.

The square root of 644433134 is about 25385.6875817851. The cubic root of 644433134 is about 863.7590697316.

The spelling of 644433134 in words is "six hundred forty-four million, four hundred thirty-three thousand, one hundred thirty-four".