684688658 has 8 divisors (see below), whose sum is σ = 1027686528. Its totient is φ = 342126484.

The previous prime is 684688639. The next prime is 684688691. The reversal of 684688658 is 856886486.

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

It is a junction number, because it is equal to n+sod(n) for n = 684688597 and 684688606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104966 + ... + 111297.

It is an arithmetic number, because the mean of its divisors is an integer number (128460816).

Almost surely, 2^684688658 is an apocalyptic number.

684688658 is a deficient number, since it is larger than the sum of its proper divisors (342997870).

684688658 is a wasteful number, since it uses less digits than its factorization.

684688658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217848.

The product of its digits is 17694720, while the sum is 59.

The square root of 684688658 is about 26166.5560974309. The cubic root of 684688658 is about 881.3824079638.

The spelling of 684688658 in words is "six hundred eighty-four million, six hundred eighty-eight thousand, six hundred fifty-eight".