680609389 has 4 divisors (see below), whose sum is σ = 697209660. Its totient is φ = 664009120.

The previous prime is 680609387. The next prime is 680609401. The reversal of 680609389 is 983906086.

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 283922500 + 396686889 = 16850^2 + 19917^2 .

It is a cyclic number.

It is not a de Polignac number, because 680609389 - 2¹ = 680609387 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 (680609387) 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 3 ways as a sum of consecutive naturals, for example, 8300074 + ... + 8300155.

It is an arithmetic number, because the mean of its divisors is an integer number (174302415).

Almost surely, 2^680609389 is an apocalyptic number.

It is an amenable number.

680609389 is a deficient number, since it is larger than the sum of its proper divisors (16600271).

680609389 is a wasteful number, since it uses less digits than its factorization.

680609389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16600270.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 680609389 is about 26088.4915048762. The cubic root of 680609389 is about 879.6285402798.

The spelling of 680609389 in words is "six hundred eighty million, six hundred nine thousand, three hundred eighty-nine".