644320119 has 16 divisors (see below), whose sum is σ = 881379072. Its totient is φ = 418546368.

The previous prime is 644320097. The next prime is 644320123. The reversal of 644320119 is 911023446.

It is not a de Polignac number, because 644320119 - 2⁹ = 644319607 is a prime.

It is a super-2 number, since 2×644320119² = 830296831496348322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644320139) 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, 454 + ... + 35900.

It is an arithmetic number, because the mean of its divisors is an integer number (55086192).

Almost surely, 2^644320119 is an apocalyptic number.

644320119 is a deficient number, since it is larger than the sum of its proper divisors (237058953).

644320119 is a wasteful number, since it uses less digits than its factorization.

644320119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35606.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 644320119 is about 25383.4615251742. The cubic root of 644320119 is about 863.7085739635.

It can be divided in two parts, 6443 and 20119, that added together give a palindrome (26562).

The spelling of 644320119 in words is "six hundred forty-four million, three hundred twenty thousand, one hundred nineteen".