644607422 has 8 divisors (see below), whose sum is σ = 967075200. Its totient is φ = 322249024.

The previous prime is 644607419. The next prime is 644607449. The reversal of 644607422 is 224706446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 10547 + ... + 37422.

It is an arithmetic number, because the mean of its divisors is an integer number (120884400).

Almost surely, 2^644607422 is an apocalyptic number.

644607422 is a deficient number, since it is larger than the sum of its proper divisors (322467778).

644607422 is a wasteful number, since it uses less digits than its factorization.

644607422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54690.

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 644607422 is about 25389.1201501746. The cubic root of 644607422 is about 863.8369310660.

The spelling of 644607422 in words is "six hundred forty-four million, six hundred seven thousand, four hundred twenty-two".