684448906 has 8 divisors (see below), whose sum is σ = 1027879524. Its totient is φ = 341822400.

The previous prime is 684448901. The next prime is 684448967. The reversal of 684448906 is 609844486.

It is a happy number.

684448906 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 657460881 + 26988025 = 25641^2 + 5195^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 684448906.

It is not an unprimeable number, because it can be changed into a prime (684448901) 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, 198895 + ... + 202306.

Almost surely, 2^684448906 is an apocalyptic number.

684448906 is a deficient number, since it is larger than the sum of its proper divisors (343430618).

684448906 is a wasteful number, since it uses less digits than its factorization.

684448906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402056.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 684448906 is about 26161.9744285480. The cubic root of 684448906 is about 881.2795203900.

The spelling of 684448906 in words is "six hundred eighty-four million, four hundred forty-eight thousand, nine hundred six".