687677756 has 12 divisors (see below), whose sum is σ = 1226142792. Its totient is φ = 337351248.

The previous prime is 687677747. The next prime is 687677779. The reversal of 687677756 is 657776786.

687677756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 687677695 and 687677704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621670 + ... + 1622093.

It is an arithmetic number, because the mean of its divisors is an integer number (102178566).

Almost surely, 2^687677756 is an apocalyptic number.

It is an amenable number.

687677756 is a deficient number, since it is larger than the sum of its proper divisors (538465036).

687677756 is a wasteful number, since it uses less digits than its factorization.

687677756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243820 (or 3243818 counting only the distinct ones).

The product of its digits is 20744640, while the sum is 59.

The square root of 687677756 is about 26223.6106590988. The cubic root of 687677756 is about 882.6631428039.

The spelling of 687677756 in words is "six hundred eighty-seven million, six hundred seventy-seven thousand, seven hundred fifty-six".