664352406 has 12 divisors (see below), whose sum is σ = 1439430252. Its totient is φ = 221450796.

The previous prime is 664352389. The next prime is 664352419. The reversal of 664352406 is 604253466.

664352406 is a `hidden beast` number, since 6 + 643 + 5 + 2 + 4 + 0 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18454216 + ... + 18454251.

It is an arithmetic number, because the mean of its divisors is an integer number (119952521).

Almost surely, 2^664352406 is an apocalyptic number.

664352406 is an abundant number, since it is smaller than the sum of its proper divisors (775077846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664352406 is a wasteful number, since it uses less digits than its factorization.

664352406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36908475 (or 36908472 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 664352406 is about 25775.0345489584. The cubic root of 664352406 is about 872.5684463398.

It can be divided in two parts, 6643 and 52406, that added together give a 10-th power (59049 = 3¹⁰).

The spelling of 664352406 in words is "six hundred sixty-four million, three hundred fifty-two thousand, four hundred six".