687881677 has 16 divisors (see below), whose sum is σ = 830730240. Its totient is φ = 556828272.

The previous prime is 687881627. The next prime is 687881683. The reversal of 687881677 is 776188786.

It is a de Polignac number, because none of the positive numbers 2^k-687881677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687881627) 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 15 ways as a sum of consecutive naturals, for example, 14323 + ... + 39760.

It is an arithmetic number, because the mean of its divisors is an integer number (51920640).

Almost surely, 2^687881677 is an apocalyptic number.

It is an amenable number.

687881677 is a deficient number, since it is larger than the sum of its proper divisors (142848563).

687881677 is a wasteful number, since it uses less digits than its factorization.

687881677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54192.

The product of its digits is 6322176, while the sum is 58.

The square root of 687881677 is about 26227.4984891812. The cubic root of 687881677 is about 882.7503812236.

The spelling of 687881677 in words is "six hundred eighty-seven million, eight hundred eighty-one thousand, six hundred seventy-seven".