680990 has 8 divisors (see below), whose sum is σ = 1225800. Its totient is φ = 272392.

The previous prime is 680989. The next prime is 680993. The reversal of 680990 is 99086.

It is a happy number.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680990.

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, 34040 + ... + 34059.

It is an arithmetic number, because the mean of its divisors is an integer number (153225).

2⁶⁸⁰⁹⁹⁰ is an apocalyptic number.

680990 is a deficient number, since it is larger than the sum of its proper divisors (544810).

680990 is a wasteful number, since it uses less digits than its factorization.

680990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68106.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 680990 is about 825.2211824717. The cubic root of 680990 is about 87.9792478614.

The spelling of 680990 in words is "six hundred eighty thousand, nine hundred ninety".