1644423064 has 8 divisors (see below), whose sum is σ = 3083293260. Its totient is φ = 822211528.

The previous prime is 1644423049. The next prime is 1644423091. The reversal of 1644423064 is 4603244461.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102776434 + ... + 102776449.

Almost surely, 2^1644423064 is an apocalyptic number.

It is an amenable number.

1644423064 is a deficient number, since it is larger than the sum of its proper divisors (1438870196).

1644423064 is a wasteful number, since it uses less digits than its factorization.

1644423064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205552889 (or 205552885 counting only the distinct ones).

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

The square root of 1644423064 is about 40551.4865818751. The cubic root of 1644423064 is about 1180.3329195647.

The spelling of 1644423064 in words is "one billion, six hundred forty-four million, four hundred twenty-three thousand, sixty-four".