689723866 has 8 divisors (see below), whose sum is σ = 1114169364. Its totient is φ = 318334080.

The previous prime is 689723857. The next prime is 689723869. The reversal of 689723866 is 668327986.

It is a happy number.

689723866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 677508841 + 12215025 = 26029^2 + 3495^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×689723866² = 951438022659971912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689723869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13263895 + ... + 13263946.

Almost surely, 2^689723866 is an apocalyptic number.

689723866 is a deficient number, since it is larger than the sum of its proper divisors (424445498).

689723866 is a wasteful number, since it uses less digits than its factorization.

689723866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26527856.

The product of its digits is 5225472, while the sum is 55.

The square root of 689723866 is about 26262.5944262938. The cubic root of 689723866 is about 883.5376985637.

The spelling of 689723866 in words is "six hundred eighty-nine million, seven hundred twenty-three thousand, eight hundred sixty-six".