687687767 has 16 divisors (see below), whose sum is σ = 781640160. Its totient is φ = 599778432.

The previous prime is 687687761. The next prime is 687687769. The reversal of 687687767 is 767786786.

It is a cyclic number.

It is not a de Polignac number, because 687687767 - 2¹⁰ = 687686743 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 (687687761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94553 + ... + 101565.

It is an arithmetic number, because the mean of its divisors is an integer number (48852510).

Almost surely, 2^687687767 is an apocalyptic number.

687687767 is a deficient number, since it is larger than the sum of its proper divisors (93952393).

687687767 is a wasteful number, since it uses less digits than its factorization.

687687767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7442.

The product of its digits is 33191424, while the sum is 62.

The square root of 687687767 is about 26223.8015360092. The cubic root of 687687767 is about 882.6674259621.

The spelling of 687687767 in words is "six hundred eighty-seven million, six hundred eighty-seven thousand, seven hundred sixty-seven".