688086387 has 32 divisors (see below), whose sum is σ = 1098028800. Its totient is φ = 424460736.

The previous prime is 688086361. The next prime is 688086389. The reversal of 688086387 is 783680886.

It is a happy number.

688086387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 688086387 - 2¹⁸ = 687824243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688086389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6463 + ... + 37655.

It is an arithmetic number, because the mean of its divisors is an integer number (34313400).

Almost surely, 2^688086387 is an apocalyptic number.

688086387 is a deficient number, since it is larger than the sum of its proper divisors (409942413).

688086387 is a wasteful number, since it uses less digits than its factorization.

688086387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31264 (or 31258 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 688086387 is about 26231.4007822686. The cubic root of 688086387 is about 882.8379398419.

The spelling of 688086387 in words is "six hundred eighty-eight million, eighty-six thousand, three hundred eighty-seven".