680739 has 4 divisors (see below), whose sum is σ = 907656. Its totient is φ = 453824.

The previous prime is 680707. The next prime is 680749. The reversal of 680739 is 937086.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 680739 - 2⁵ = 680707 is a prime.

It is a super-2 number, since 2×680739² = 926811172242, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (680749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113454 + ... + 113459.

It is an arithmetic number, because the mean of its divisors is an integer number (226914).

2⁶⁸⁰⁷³⁹ is an apocalyptic number.

680739 is a deficient number, since it is larger than the sum of its proper divisors (226917).

680739 is a wasteful number, since it uses less digits than its factorization.

680739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226916.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 680739 is about 825.0690880163. The cubic root of 680739 is about 87.9684373724.

The spelling of 680739 in words is "six hundred eighty thousand, seven hundred thirty-nine".