644361522 has 32 divisors (see below), whose sum is σ = 1477592064. Its totient is φ = 183507600.

The previous prime is 644361521. The next prime is 644361533. The reversal of 644361522 is 225163446.

It is not an unprimeable number, because it can be changed into a prime (644361521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11604 + ... + 37727.

It is an arithmetic number, because the mean of its divisors is an integer number (46174752).

Almost surely, 2^644361522 is an apocalyptic number.

644361522 is an abundant number, since it is smaller than the sum of its proper divisors (833230542).

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

644361522 is a wasteful number, since it uses less digits than its factorization.

644361522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49654.

The product of its digits is 34560, while the sum is 33.

The square root of 644361522 is about 25384.2770627804. The cubic root of 644361522 is about 863.7270737533.

The spelling of 644361522 in words is "six hundred forty-four million, three hundred sixty-one thousand, five hundred twenty-two".