681344 has 16 divisors (see below), whose sum is σ = 1357620. Its totient is φ = 340608.

The previous prime is 681341. The next prime is 681361. The reversal of 681344 is 443186.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681341) by changing a digit.

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, 2534 + ... + 2789.

681344 is a Friedman number, since it can be written as (44^3-16)*8, using all its digits and the basic arithmetic operations.

2⁶⁸¹³⁴⁴ is an apocalyptic number.

681344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

681344 is a deficient number, since it is larger than the sum of its proper divisors (676276).

681344 is an equidigital number, since it uses as much as digits as its factorization.

681344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337 (or 5325 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 681344 is about 825.4356425549. The cubic root of 681344 is about 87.9944900131.

The spelling of 681344 in words is "six hundred eighty-one thousand, three hundred forty-four".