644202244 has 12 divisors (see below), whose sum is σ = 1288404544. Its totient is φ = 276086664.

The previous prime is 644202217. The next prime is 644202287. The reversal of 644202244 is 442202446.

644202244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

644202244 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 23007223 = 644202244 / (6 + 4 + 4 + 2 + 0 + 2 + 2 + 4 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11503584 + ... + 11503639.

Almost surely, 2^644202244 is an apocalyptic number.

It is an amenable number.

644202244 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.

644202244 is a wasteful number, since it uses less digits than its factorization.

644202244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23007234 (or 23007232 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

The square root of 644202244 is about 25381.1395331258. The cubic root of 644202244 is about 863.6559004273.

It can be divided in two parts, 644202 and 244, that added together give a palindrome (644446).

The spelling of 644202244 in words is "six hundred forty-four million, two hundred two thousand, two hundred forty-four".