687687766 has 8 divisors (see below), whose sum is σ = 1038953160. Its totient is φ = 341370048.

The previous prime is 687687761. The next prime is 687687769. The reversal of 687687766 is 667786786.

687687766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687687761) 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, 1236571 + ... + 1237126.

It is an arithmetic number, because the mean of its divisors is an integer number (129869145).

Almost surely, 2^687687766 is an apocalyptic number.

687687766 is a deficient number, since it is larger than the sum of its proper divisors (351265394).

687687766 is a wasteful number, since it uses less digits than its factorization.

687687766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473838.

The product of its digits is 28449792, while the sum is 61.

The square root of 687687766 is about 26223.8015169426. The cubic root of 687687766 is about 882.6674255342.

The spelling of 687687766 in words is "six hundred eighty-seven million, six hundred eighty-seven thousand, seven hundred sixty-six".