689969986 has 16 divisors (see below), whose sum is σ = 1049613048. Its totient is φ = 340128000.

The previous prime is 689969981. The next prime is 689969993.

689969986 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 651219361 + 38750625 = 25519^2 + 6225^2 .

It is not an unprimeable number, because it can be changed into a prime (689969981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41596 + ... + 55768.

Almost surely, 2^689969986 is an apocalyptic number.

689969986 is a deficient number, since it is larger than the sum of its proper divisors (359643062).

689969986 is a wasteful number, since it uses less digits than its factorization.

689969986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14517.

The product of its digits is 90699264, while the sum is 70.

The square root of 689969986 is about 26267.2797601883. The cubic root of 689969986 is about 883.6427794754.

The spelling of 689969986 in words is "six hundred eighty-nine million, nine hundred sixty-nine thousand, nine hundred eighty-six".