688163646 has 8 divisors (see below), whose sum is σ = 1376327304. Its totient is φ = 229387880.

The previous prime is 688163617. The next prime is 688163647. The reversal of 688163646 is 646361886.

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

688163646 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 688163595 and 688163604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688163647) by changing a digit.

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, 57346965 + ... + 57346976.

It is an arithmetic number, because the mean of its divisors is an integer number (172040913).

Almost surely, 2^688163646 is an apocalyptic number.

688163646 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.

688163646 is a wasteful number, since it uses less digits than its factorization.

688163646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114693946.

The product of its digits is 995328, while the sum is 48.

The square root of 688163646 is about 26232.8733843626. The cubic root of 688163646 is about 882.8709805691.

The spelling of 688163646 in words is "six hundred eighty-eight million, one hundred sixty-three thousand, six hundred forty-six".