688704234 has 8 divisors (see below), whose sum is σ = 1377408480. Its totient is φ = 229568076.

The previous prime is 688704197. The next prime is 688704241. The reversal of 688704234 is 432407886.

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

688704234 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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, 57392014 + ... + 57392025.

It is an arithmetic number, because the mean of its divisors is an integer number (172176060).

Almost surely, 2^688704234 is an apocalyptic number.

688704234 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.

688704234 is a wasteful number, since it uses less digits than its factorization.

688704234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114784044.

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 688704234 is about 26243.1749984639. The cubic root of 688704234 is about 883.1021002752.

The spelling of 688704234 in words is "six hundred eighty-eight million, seven hundred four thousand, two hundred thirty-four".