680999 has 4 divisors (see below), whose sum is σ = 742920. Its totient is φ = 619080.

The previous prime is 680993. The next prime is 681001. The reversal of 680999 is 999086.

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

It is not a de Polignac number, because 680999 - 2¹² = 676903 is a prime.

It is a Duffinian number.

680999 is a modest number, since divided by 999 gives 680 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680993) 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, 30944 + ... + 30965.

It is an arithmetic number, because the mean of its divisors is an integer number (185730).

2⁶⁸⁰⁹⁹⁹ is an apocalyptic number.

680999 is a deficient number, since it is larger than the sum of its proper divisors (61921).

680999 is a wasteful number, since it uses less digits than its factorization.

680999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61920.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 680999 is about 825.2266355372. The cubic root of 680999 is about 87.9796354392.

The spelling of 680999 in words is "six hundred eighty thousand, nine hundred ninety-nine".