689585986 has 4 divisors (see below), whose sum is σ = 1034378982. Its totient is φ = 344792992.

The previous prime is 689585947. The next prime is 689585987.

689585986 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 685444761 + 4141225 = 26181^2 + 2035^2 .

It is not an unprimeable number, because it can be changed into a prime (689585987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172396495 + ... + 172396498.

Almost surely, 2^689585986 is an apocalyptic number.

689585986 is a deficient number, since it is larger than the sum of its proper divisors (344792996).

689585986 is a wasteful number, since it uses less digits than its factorization.

689585986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344792995.

The product of its digits is 37324800, while the sum is 64.

The square root of 689585986 is about 26259.9692688320. The cubic root of 689585986 is about 883.4788197851.

The spelling of 689585986 in words is "six hundred eighty-nine million, five hundred eighty-five thousand, nine hundred eighty-six".