644803422 has 16 divisors (see below), whose sum is σ = 1290174480. Its totient is φ = 214839872.

The previous prime is 644803409. The next prime is 644803427. The reversal of 644803422 is 224308446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644803427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8097 + ... + 36812.

It is an arithmetic number, because the mean of its divisors is an integer number (80635905).

Almost surely, 2^644803422 is an apocalyptic number.

644803422 is an abundant number, since it is smaller than the sum of its proper divisors (645371058).

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

644803422 is a wasteful number, since it uses less digits than its factorization.

644803422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47307.

The product of its (nonzero) digits is 36864, while the sum is 33.

The square root of 644803422 is about 25392.9797778835. The cubic root of 644803422 is about 863.9244752442.

The spelling of 644803422 in words is "six hundred forty-four million, eight hundred three thousand, four hundred twenty-two".