689934609 has 48 divisors (see below), whose sum is σ = 1238170752. Its totient is φ = 360474624.

The previous prime is 689934589. The next prime is 689934649. The reversal of 689934609 is 906439986.

It is a happy number.

It is not a de Polignac number, because 689934609 - 2⁸ = 689934353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (689934649) 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 47 ways as a sum of consecutive naturals, for example, 83697 + ... + 91569.

It is an arithmetic number, because the mean of its divisors is an integer number (25795224).

Almost surely, 2^689934609 is an apocalyptic number.

It is an amenable number.

689934609 is a deficient number, since it is larger than the sum of its proper divisors (548236143).

689934609 is a wasteful number, since it uses less digits than its factorization.

689934609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006 (or 8003 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 689934609 is about 26266.6063472235. The cubic root of 689934609 is about 883.6276768064.

The spelling of 689934609 in words is "six hundred eighty-nine million, nine hundred thirty-four thousand, six hundred nine".