689557687 has 24 divisors (see below), whose sum is σ = 890486784. Its totient is φ = 521842464.

The previous prime is 689557681. The next prime is 689557697. The reversal of 689557687 is 786755986.

689557687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 689557687 - 2¹⁹ = 689033399 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 (689557681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14538 + ... + 39880.

It is an arithmetic number, because the mean of its divisors is an integer number (37103616).

Almost surely, 2^689557687 is an apocalyptic number.

689557687 is a deficient number, since it is larger than the sum of its proper divisors (200929097).

689557687 is a wasteful number, since it uses less digits than its factorization.

689557687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25399 (or 25386 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 61.

The square root of 689557687 is about 26259.4304393679. The cubic root of 689557687 is about 883.4667343166.

The spelling of 689557687 in words is "six hundred eighty-nine million, five hundred fifty-seven thousand, six hundred eighty-seven".