680581 has 4 divisors (see below), whose sum is σ = 742464. Its totient is φ = 618700.

The previous prime is 680569. The next prime is 680587. The reversal of 680581 is 185086.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 680581 - 2⁷ = 680453 is a prime.

It is a super-2 number, since 2×680581² = 926380995122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680587) 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, 30925 + ... + 30946.

It is an arithmetic number, because the mean of its divisors is an integer number (185616).

2⁶⁸⁰⁵⁸¹ is an apocalyptic number.

It is an amenable number.

680581 is a deficient number, since it is larger than the sum of its proper divisors (61883).

680581 is a wasteful number, since it uses less digits than its factorization.

680581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61882.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 680581 is about 824.9733329023. The cubic root of 680581 is about 87.9616310004.

It can be divided in two parts, 6805 and 81, that added together give a palindrome (6886).

The spelling of 680581 in words is "six hundred eighty thousand, five hundred eighty-one".