689266637 has 4 divisors (see below), whose sum is σ = 689424540. Its totient is φ = 689108736.

The previous prime is 689266631. The next prime is 689266663. The reversal of 689266637 is 736662986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 657973801 + 31292836 = 25651^2 + 5594^2 .

It is a cyclic number.

It is not a de Polignac number, because 689266637 - 2²⁸ = 420831181 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 (689266631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72212 + ... + 81197.

It is an arithmetic number, because the mean of its divisors is an integer number (172356135).

Almost surely, 2^689266637 is an apocalyptic number.

It is an amenable number.

689266637 is a deficient number, since it is larger than the sum of its proper divisors (157903).

689266637 is a wasteful number, since it uses less digits than its factorization.

689266637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157902.

The product of its digits is 3919104, while the sum is 53.

The square root of 689266637 is about 26253.8880358700. Note that the first 3 decimals coincide. The cubic root of 689266637 is about 883.3424183077.

The spelling of 689266637 in words is "six hundred eighty-nine million, two hundred sixty-six thousand, six hundred thirty-seven".