644654622 has 16 divisors (see below), whose sum is σ = 1289903760. Its totient is φ = 214785792.

The previous prime is 644654597. The next prime is 644654627. The reversal of 644654622 is 226456446.

644654622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644654627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9997 + ... + 37272.

It is an arithmetic number, because the mean of its divisors is an integer number (80618985).

Almost surely, 2^644654622 is an apocalyptic number.

644654622 is an abundant number, since it is smaller than the sum of its proper divisors (645249138).

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

644654622 is a wasteful number, since it uses less digits than its factorization.

644654622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49547.

The product of its digits is 276480, while the sum is 39.

The square root of 644654622 is about 25390.0496651740. The cubic root of 644654622 is about 863.8580147554.

The spelling of 644654622 in words is "six hundred forty-four million, six hundred fifty-four thousand, six hundred twenty-two".