680659309 has 8 divisors (see below), whose sum is σ = 774821952. Its totient is φ = 591877440.

The previous prime is 680659307. The next prime is 680659349. The reversal of 680659309 is 903956086.

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

It is not a de Polignac number, because 680659309 - 2¹ = 680659307 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 (680659307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344924 + ... + 1345429.

It is an arithmetic number, because the mean of its divisors is an integer number (96852744).

Almost surely, 2^680659309 is an apocalyptic number.

It is an amenable number.

680659309 is a deficient number, since it is larger than the sum of its proper divisors (94162643).

680659309 is a wasteful number, since it uses less digits than its factorization.

680659309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690387.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 680659309 is about 26089.4482310378. The cubic root of 680659309 is about 879.6500455092.

The spelling of 680659309 in words is "six hundred eighty million, six hundred fifty-nine thousand, three hundred nine".