688646632 has 16 divisors (see below), whose sum is σ = 1318685760. Its totient is φ = 336997104.

The previous prime is 688646599. The next prime is 688646633. The reversal of 688646632 is 236646886.

It is a happy number.

688646632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (688646633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915378 + ... + 916129.

It is an arithmetic number, because the mean of its divisors is an integer number (82417860).

Almost surely, 2^688646632 is an apocalyptic number.

It is an amenable number.

688646632 is a deficient number, since it is larger than the sum of its proper divisors (630039128).

688646632 is a wasteful number, since it uses less digits than its factorization.

688646632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831560 (or 1831556 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 49.

The square root of 688646632 is about 26242.0775092217. The cubic root of 688646632 is about 883.0774792246.

The spelling of 688646632 in words is "six hundred eighty-eight million, six hundred forty-six thousand, six hundred thirty-two".