680813 has 4 divisors (see below), whose sum is σ = 778080. Its totient is φ = 583548.

The previous prime is 680809. The next prime is 680831. The reversal of 680813 is 318086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 680813 - 2² = 680809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680803) 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, 48623 + ... + 48636.

It is an arithmetic number, because the mean of its divisors is an integer number (194520).

2⁶⁸⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

680813 is a deficient number, since it is larger than the sum of its proper divisors (97267).

680813 is an equidigital number, since it uses as much as digits as its factorization.

680813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97266.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 680813 is about 825.1139315270. The cubic root of 680813 is about 87.9716248047.

Adding to 680813 its reverse (318086), we get a palindrome (998899).

The spelling of 680813 in words is "six hundred eighty thousand, eight hundred thirteen".