680693 has 4 divisors (see below), whose sum is σ = 733068. Its totient is φ = 628320.

The previous prime is 680681. The next prime is 680707. The reversal of 680693 is 396086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 396086 = 2 ⋅198043.

It can be written as a sum of positive squares in 2 ways, for example, as 69169 + 611524 = 263^2 + 782^2 .

It is a cyclic number.

It is not a de Polignac number, because 680693 - 2¹⁰ = 679669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26168 + ... + 26193.

It is an arithmetic number, because the mean of its divisors is an integer number (183267).

2⁶⁸⁰⁶⁹³ is an apocalyptic number.

It is an amenable number.

680693 is a deficient number, since it is larger than the sum of its proper divisors (52375).

680693 is a wasteful number, since it uses less digits than its factorization.

680693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52374.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 680693 is about 825.0412110919. The cubic root of 680693 is about 87.9664558791.

The spelling of 680693 in words is "six hundred eighty thousand, six hundred ninety-three".