664444634 has 8 divisors (see below), whose sum is σ = 1139047968. Its totient is φ = 284761980.

The previous prime is 664444601. The next prime is 664444661. The reversal of 664444634 is 436444466.

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

It is a junction number, because it is equal to n+sod(n) for n = 664444591 and 664444600.

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, 23730152 + ... + 23730179.

It is an arithmetic number, because the mean of its divisors is an integer number (142380996).

Almost surely, 2^664444634 is an apocalyptic number.

664444634 is a deficient number, since it is larger than the sum of its proper divisors (474603334).

664444634 is a wasteful number, since it uses less digits than its factorization.

664444634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47460340.

The product of its digits is 663552, while the sum is 41.

The square root of 664444634 is about 25776.8235824354. The cubic root of 664444634 is about 872.6088222599.

The spelling of 664444634 in words is "six hundred sixty-four million, four hundred forty-four thousand, six hundred thirty-four".