681056 has 12 divisors (see below), whose sum is σ = 1340892. Its totient is φ = 340512.

The previous prime is 681049. The next prime is 681061. The reversal of 681056 is 650186.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

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 681056.

It is an unprimeable number.

681056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610 + ... + 10673.

It is an arithmetic number, because the mean of its divisors is an integer number (111741).

2⁶⁸¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

681056 is a deficient number, since it is larger than the sum of its proper divisors (659836).

681056 is a wasteful number, since it uses less digits than its factorization.

681056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21293 (or 21285 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 681056 is about 825.2611707817. The cubic root of 681056 is about 87.9820900191.

The spelling of 681056 in words is "six hundred eighty-one thousand, fifty-six".