688340056 has 32 divisors (see below), whose sum is σ = 1405422000. Its totient is φ = 314810496.

The previous prime is 688340053. The next prime is 688340057. The reversal of 688340056 is 650043886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688340053) 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 7 ways as a sum of consecutive naturals, for example, 73671 + ... + 82486.

Almost surely, 2^688340056 is an apocalyptic number.

It is an amenable number.

688340056 is an abundant number, since it is smaller than the sum of its proper divisors (717081944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688340056 is a wasteful number, since it uses less digits than its factorization.

688340056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156211 (or 156207 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 688340056 is about 26236.2355531429. The cubic root of 688340056 is about 882.9464151279.

The spelling of 688340056 in words is "six hundred eighty-eight million, three hundred forty thousand, fifty-six".