687934689 has 16 divisors (see below), whose sum is σ = 988294272. Its totient is φ = 423134208.

The previous prime is 687934651. The next prime is 687934693. The reversal of 687934689 is 986439786.

It is not a de Polignac number, because 687934689 - 2⁷ = 687934561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687934619) 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, 119532 + ... + 125154.

It is an arithmetic number, because the mean of its divisors is an integer number (61768392).

Almost surely, 2^687934689 is an apocalyptic number.

It is an amenable number.

687934689 is a deficient number, since it is larger than the sum of its proper divisors (300359583).

687934689 is a wasteful number, since it uses less digits than its factorization.

687934689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8776.

The product of its digits is 15676416, while the sum is 60.

The square root of 687934689 is about 26228.5090883946. The cubic root of 687934689 is about 882.7730571977.

The spelling of 687934689 in words is "six hundred eighty-seven million, nine hundred thirty-four thousand, six hundred eighty-nine".