664723606 has 8 divisors (see below), whose sum is σ = 1004697144. Its totient is φ = 329824560.

The previous prime is 664723601. The next prime is 664723651. The reversal of 664723606 is 606327466.

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 (664723601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268295 + ... + 1268818.

It is an arithmetic number, because the mean of its divisors is an integer number (125587143).

Almost surely, 2^664723606 is an apocalyptic number.

664723606 is a deficient number, since it is larger than the sum of its proper divisors (339973538).

664723606 is a wasteful number, since it uses less digits than its factorization.

664723606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537246.

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 664723606 is about 25782.2343096947. The cubic root of 664723606 is about 872.7309289310.

The spelling of 664723606 in words is "six hundred sixty-four million, seven hundred twenty-three thousand, six hundred six".