688675646 has 8 divisors (see below), whose sum is σ = 1040899464. Its totient is φ = 341709160.

The previous prime is 688675619. The next prime is 688675667. The reversal of 688675646 is 646576886.

It is a happy number.

688675646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 688675591 and 688675600.

It is a congruent 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, 1314005 + ... + 1314528.

It is an arithmetic number, because the mean of its divisors is an integer number (130112433).

Almost surely, 2^688675646 is an apocalyptic number.

688675646 is a deficient number, since it is larger than the sum of its proper divisors (352223818).

688675646 is a wasteful number, since it uses less digits than its factorization.

688675646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628666.

The product of its digits is 11612160, while the sum is 56.

The square root of 688675646 is about 26242.6303178626. The cubic root of 688675646 is about 883.0898809650.

The spelling of 688675646 in words is "six hundred eighty-eight million, six hundred seventy-five thousand, six hundred forty-six".