644002422 has 32 divisors (see below), whose sum is σ = 1477757952. Its totient is φ = 183281664.

The previous prime is 644002393. The next prime is 644002433. The reversal of 644002422 is 224200446.

644002422 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644002392 and 644002401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19038 + ... + 40625.

It is an arithmetic number, because the mean of its divisors is an integer number (46179936).

Almost surely, 2^644002422 is an apocalyptic number.

644002422 is an abundant number, since it is smaller than the sum of its proper divisors (833755530).

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

644002422 is a wasteful number, since it uses less digits than its factorization.

644002422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59932.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 644002422 is about 25377.2028009393. The cubic root of 644002422 is about 863.5665934343.

Adding to 644002422 its reverse (224200446), we get a palindrome (868202868).

The spelling of 644002422 in words is "six hundred forty-four million, two thousand, four hundred twenty-two".