680781 has 8 divisors (see below), whose sum is σ = 914400. Its totient is φ = 450512.

The previous prime is 680767. The next prime is 680783. The reversal of 680781 is 187086.

680781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 680781 - 2⁵ = 680749 is a prime.

It is a super-2 number, since 2×680781² = 926925539922, which contains 22 as substring.

It is an Ulam number.

680781 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680781.

It is not an unprimeable number, because it can be changed into a prime (680783) 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, 315 + ... + 1208.

It is an arithmetic number, because the mean of its divisors is an integer number (114300).

2⁶⁸⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

680781 is a deficient number, since it is larger than the sum of its proper divisors (233619).

680781 is a wasteful number, since it uses less digits than its factorization.

680781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 680781 is about 825.0945400377. The cubic root of 680781 is about 87.9702464839.

The spelling of 680781 in words is "six hundred eighty thousand, seven hundred eighty-one".