664340806 has 8 divisors (see below), whose sum is σ = 996821064. Its totient is φ = 332067120.

The previous prime is 664340801. The next prime is 664340837. The reversal of 664340806 is 608043466.

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 (664340801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43335 + ... + 56626.

It is an arithmetic number, because the mean of its divisors is an integer number (124602633).

Almost surely, 2^664340806 is an apocalyptic number.

664340806 is a deficient number, since it is larger than the sum of its proper divisors (332480258).

664340806 is a wasteful number, since it uses less digits than its factorization.

664340806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103286.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 664340806 is about 25774.8095240295. The cubic root of 664340806 is about 872.5633677837.

The spelling of 664340806 in words is "six hundred sixty-four million, three hundred forty thousand, eight hundred six".