687930689 has 2 divisors, whose sum is σ = 687930690. Its totient is φ = 687930688.

The previous prime is 687930671. The next prime is 687930743. The reversal of 687930689 is 986039786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395691664 + 292239025 = 19892^2 + 17095^2 .

It is a cyclic number.

It is not a de Polignac number, because 687930689 - 2⁸ = 687930433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687932689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343965344 + 343965345.

It is an arithmetic number, because the mean of its divisors is an integer number (343965345).

Almost surely, 2^687930689 is an apocalyptic number.

It is an amenable number.

687930689 is a deficient number, since it is larger than the sum of its proper divisors (1).

687930689 is an equidigital number, since it uses as much as digits as its factorization.

687930689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 687930689 is about 26228.4328353792. The cubic root of 687930689 is about 882.7713462314.

The spelling of 687930689 in words is "six hundred eighty-seven million, nine hundred thirty thousand, six hundred eighty-nine".