644362222 has 16 divisors (see below), whose sum is σ = 1108925280. Its totient is φ = 275079168.

The previous prime is 644362211. The next prime is 644362241. The reversal of 644362222 is 222263446.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 85947 + ... + 93142.

It is an arithmetic number, because the mean of its divisors is an integer number (69307830).

Almost surely, 2^644362222 is an apocalyptic number.

644362222 is a deficient number, since it is larger than the sum of its proper divisors (464563058).

644362222 is a wasteful number, since it uses less digits than its factorization.

644362222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179355.

The product of its digits is 27648, while the sum is 31.

The square root of 644362222 is about 25384.2908508392. The cubic root of 644362222 is about 863.7273865222.

The spelling of 644362222 in words is "six hundred forty-four million, three hundred sixty-two thousand, two hundred twenty-two".