664742446 has 8 divisors (see below), whose sum is σ = 997566120. Its totient is φ = 332220408.

The previous prime is 664742423. The next prime is 664742447. The reversal of 664742446 is 644247466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664742447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69816 + ... + 78763.

It is an arithmetic number, because the mean of its divisors is an integer number (124695765).

Almost surely, 2^664742446 is an apocalyptic number.

664742446 is a deficient number, since it is larger than the sum of its proper divisors (332823674).

664742446 is a wasteful number, since it uses less digits than its factorization.

664742446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150818.

The product of its digits is 774144, while the sum is 43.

The square root of 664742446 is about 25782.5996749746. The cubic root of 664742446 is about 872.7391740098.

The spelling of 664742446 in words is "six hundred sixty-four million, seven hundred forty-two thousand, four hundred forty-six".