680658 has 16 divisors (see below), whose sum is σ = 1485216. Its totient is φ = 206240.

The previous prime is 680657. The next prime is 680681. The reversal of 680658 is 856086.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (680651) 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, 5091 + ... + 5222.

It is an arithmetic number, because the mean of its divisors is an integer number (92826).

2⁶⁸⁰⁶⁵⁸ is an apocalyptic number.

680658 is an abundant number, since it is smaller than the sum of its proper divisors (804558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

680658 is a wasteful number, since it uses less digits than its factorization.

680658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 680658 is about 825.0199997576. The cubic root of 680658 is about 87.9649481613.

Subtracting from 680658 its sum of digits (33), we obtain a square (680625 = 825²).

The spelling of 680658 in words is "six hundred eighty thousand, six hundred fifty-eight".