689989986 has 144 divisors (see below), whose sum is σ = 1819611456. Its totient is φ = 184928832.

The previous prime is 689989973. The next prime is 689989991.

689989986 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10298325 + ... + 10298391.

Almost surely, 2^689989986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 689989986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909805728).

689989986 is an abundant number, since it is smaller than the sum of its proper divisors (1129621470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689989986 is a wasteful number, since it uses less digits than its factorization.

689989986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 163 counting only the distinct ones).

The product of its digits is 120932352, while the sum is 72.

The square root of 689989986 is about 26267.6604592034. The cubic root of 689989986 is about 883.6513173757.

The spelling of 689989986 in words is "six hundred eighty-nine million, nine hundred eighty-nine thousand, nine hundred eighty-six".