684338906 has 8 divisors (see below), whose sum is σ = 1027175700. Its totient is φ = 341947008.

The previous prime is 684338899. The next prime is 684338917. The reversal of 684338906 is 609833486.

684338906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 622951681 + 61387225 = 24959^2 + 7835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107351 + ... + 113546.

Almost surely, 2^684338906 is an apocalyptic number.

684338906 is a deficient number, since it is larger than the sum of its proper divisors (342836794).

684338906 is a wasteful number, since it uses less digits than its factorization.

684338906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222448.

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 684338906 is about 26159.8720562620. The cubic root of 684338906 is about 881.2323067655.

The spelling of 684338906 in words is "six hundred eighty-four million, three hundred thirty-eight thousand, nine hundred six".