644364222 has 8 divisors (see below), whose sum is σ = 1288728456. Its totient is φ = 214788072.

The previous prime is 644364221. The next prime is 644364239. The reversal of 644364222 is 222463446.

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

644364222 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644364221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53697013 + ... + 53697024.

It is an arithmetic number, because the mean of its divisors is an integer number (161091057).

Almost surely, 2^644364222 is an apocalyptic number.

644364222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644364222 is a wasteful number, since it uses less digits than its factorization.

644364222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107394042.

The product of its digits is 55296, while the sum is 33.

The square root of 644364222 is about 25384.3302452517. The cubic root of 644364222 is about 863.7282801463.

The spelling of 644364222 in words is "six hundred forty-four million, three hundred sixty-four thousand, two hundred twenty-two".