664285406 has 4 divisors (see below), whose sum is σ = 996428112. Its totient is φ = 332142702.

The previous prime is 664285399. The next prime is 664285423. The reversal of 664285406 is 604582466.

664285406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166071350 + ... + 166071353.

It is an arithmetic number, because the mean of its divisors is an integer number (249107028).

Almost surely, 2^664285406 is an apocalyptic number.

664285406 is a deficient number, since it is larger than the sum of its proper divisors (332142706).

664285406 is a wasteful number, since it uses less digits than its factorization.

664285406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332142705.

The product of its (nonzero) digits is 276480, while the sum is 41.

The square root of 664285406 is about 25773.7348089096. The cubic root of 664285406 is about 872.5391124849.

The spelling of 664285406 in words is "six hundred sixty-four million, two hundred eighty-five thousand, four hundred six".