664766438 has 12 divisors (see below), whose sum is σ = 1159949772. Its totient is φ = 284899860.

The previous prime is 664766413. The next prime is 664766467. The reversal of 664766438 is 834667466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3391568 + ... + 3391763.

It is an arithmetic number, because the mean of its divisors is an integer number (96662481).

Almost surely, 2^664766438 is an apocalyptic number.

664766438 is a deficient number, since it is larger than the sum of its proper divisors (495183334).

664766438 is a wasteful number, since it uses less digits than its factorization.

664766438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783347 (or 6783340 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 50.

The square root of 664766438 is about 25783.0649458128. The cubic root of 664766438 is about 872.7496735681.

The spelling of 664766438 in words is "six hundred sixty-four million, seven hundred sixty-six thousand, four hundred thirty-eight".