684516678 has 8 divisors (see below), whose sum is σ = 1369033368. Its totient is φ = 228172224.

The previous prime is 684516671. The next prime is 684516683. The reversal of 684516678 is 876615486.

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

684516678 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 684516678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684516671) 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, 57043051 + ... + 57043062.

It is an arithmetic number, because the mean of its divisors is an integer number (171129171).

Almost surely, 2^684516678 is an apocalyptic number.

684516678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

684516678 is a wasteful number, since it uses less digits than its factorization.

684516678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114086118.

The product of its digits is 1935360, while the sum is 51.

The square root of 684516678 is about 26163.2696351201. The cubic root of 684516678 is about 881.3086066149.

The spelling of 684516678 in words is "six hundred eighty-four million, five hundred sixteen thousand, six hundred seventy-eight".