689818689 has 12 divisors (see below), whose sum is σ = 1138748416. Its totient is φ = 394182072.

The previous prime is 689818637. The next prime is 689818711. The reversal of 689818689 is 986818986.

It is not a de Polignac number, because 689818689 - 2¹³ = 689810497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 10949503 = 689818689 / (6 + 8 + 9 + 8 + 1 + 8 + 6 + 8 + 9).

689818689 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689418689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5474689 + ... + 5474814.

Almost surely, 2^689818689 is an apocalyptic number.

It is an amenable number.

689818689 is a deficient number, since it is larger than the sum of its proper divisors (448929727).

689818689 is a wasteful number, since it uses less digits than its factorization.

689818689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10949516 (or 10949513 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The square root of 689818689 is about 26264.3996504775. The cubic root of 689818689 is about 883.5781861947.

The spelling of 689818689 in words is "six hundred eighty-nine million, eight hundred eighteen thousand, six hundred eighty-nine".