688828694 has 4 divisors (see below), whose sum is σ = 1033243044. Its totient is φ = 344414346.

The previous prime is 688828681. The next prime is 688828727. The reversal of 688828694 is 496828886.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 172207172 + ... + 172207175.

It is an arithmetic number, because the mean of its divisors is an integer number (258310761).

Almost surely, 2^688828694 is an apocalyptic number.

688828694 is a deficient number, since it is larger than the sum of its proper divisors (344414350).

688828694 is a wasteful number, since it uses less digits than its factorization.

688828694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344414349.

The product of its digits is 10616832, while the sum is 59.

The square root of 688828694 is about 26245.5461745417. The cubic root of 688828694 is about 883.1552940178.

The spelling of 688828694 in words is "six hundred eighty-eight million, eight hundred twenty-eight thousand, six hundred ninety-four".