684448406 has 4 divisors (see below), whose sum is σ = 1026672612. Its totient is φ = 342224202.

The previous prime is 684448399. The next prime is 684448433. The reversal of 684448406 is 604844486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604844486 = 2 ⋅302422243.

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, 171112100 + ... + 171112103.

It is an arithmetic number, because the mean of its divisors is an integer number (256668153).

Almost surely, 2^684448406 is an apocalyptic number.

684448406 is a deficient number, since it is larger than the sum of its proper divisors (342224206).

684448406 is a wasteful number, since it uses less digits than its factorization.

684448406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342224205.

The product of its (nonzero) digits is 589824, while the sum is 44.

The square root of 684448406 is about 26161.9648726926. The cubic root of 684448406 is about 881.2793057940.

The spelling of 684448406 in words is "six hundred eighty-four million, four hundred forty-eight thousand, four hundred six".