644060446 has 4 divisors (see below), whose sum is σ = 966090672. Its totient is φ = 322030222.

The previous prime is 644060441. The next prime is 644060447.

644060446 is nontrivially palindromic in base 10.

644060446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644060441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161015110 + ... + 161015113.

It is an arithmetic number, because the mean of its divisors is an integer number (241522668).

Almost surely, 2^644060446 is an apocalyptic number.

644060446 is a deficient number, since it is larger than the sum of its proper divisors (322030226).

644060446 is a wasteful number, since it uses less digits than its factorization.

644060446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322030225.

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 644060446 is about 25378.3460059950. The cubic root of 644060446 is about 863.5925281624.

The spelling of 644060446 in words is "six hundred forty-four million, sixty thousand, four hundred forty-six".