680978 has 16 divisors (see below), whose sum is σ = 1080000. Its totient is φ = 321552.

The previous prime is 680971. The next prime is 680987. The reversal of 680978 is 879086.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680978.

It is not an unprimeable number, because it can be changed into a prime (680971) by changing a digit.

680978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3323 + ... + 3521.

It is an arithmetic number, because the mean of its divisors is an integer number (67500).

2⁶⁸⁰⁹⁷⁸ is an apocalyptic number.

680978 is a deficient number, since it is larger than the sum of its proper divisors (399022).

680978 is a wasteful number, since it uses less digits than its factorization.

680978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 680978 is about 825.2139116617. The cubic root of 680978 is about 87.9787310858.

The spelling of 680978 in words is "six hundred eighty thousand, nine hundred seventy-eight".