644353422 has 32 divisors (see below), whose sum is σ = 1358985600. Its totient is φ = 203112288.

The previous prime is 644353421. The next prime is 644353427. The reversal of 644353422 is 224353446.

It is a super-3 number, since 3×644353422³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644353421) 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, 62104 + ... + 71732.

It is an arithmetic number, because the mean of its divisors is an integer number (42468300).

Almost surely, 2^644353422 is an apocalyptic number.

644353422 is an abundant number, since it is smaller than the sum of its proper divisors (714632178).

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

644353422 is a wasteful number, since it uses less digits than its factorization.

644353422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10240.

The product of its digits is 69120, while the sum is 33.

The square root of 644353422 is about 25384.1175146980. The cubic root of 644353422 is about 863.7234545538.

The spelling of 644353422 in words is "six hundred forty-four million, three hundred fifty-three thousand, four hundred twenty-two".