681807 has 8 divisors (see below), whose sum is σ = 1038976. Its totient is φ = 389592.

The previous prime is 681787. The next prime is 681809. The reversal of 681807 is 708186.

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

It is not a de Polignac number, because 681807 - 2¹⁰ = 680783 is a prime.

It is an Ulam number.

It is a Duffinian 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 681807.

It is not an unprimeable number, because it can be changed into a prime (681809) 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, 16213 + ... + 16254.

It is an arithmetic number, because the mean of its divisors is an integer number (129872).

2⁶⁸¹⁸⁰⁷ is an apocalyptic number.

681807 is a deficient number, since it is larger than the sum of its proper divisors (357169).

681807 is a wasteful number, since it uses less digits than its factorization.

681807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32477.

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

The square root of 681807 is about 825.7160528899. The cubic root of 681807 is about 88.0144174036.

The spelling of 681807 in words is "six hundred eighty-one thousand, eight hundred seven".