681756 has 12 divisors (see below), whose sum is σ = 1590792. Its totient is φ = 227248.

The previous prime is 681731. The next prime is 681763. The reversal of 681756 is 657186.

681756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28395 + ... + 28418.

It is an arithmetic number, because the mean of its divisors is an integer number (132566).

2⁶⁸¹⁷⁵⁶ is an apocalyptic number.

It is an amenable number.

681756 is an abundant number, since it is smaller than the sum of its proper divisors (909036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681756 is a wasteful number, since it uses less digits than its factorization.

681756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56820 (or 56818 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 681756 is about 825.6851700255. The cubic root of 681756 is about 88.0122228201.

The spelling of 681756 in words is "six hundred eighty-one thousand, seven hundred fifty-six".