681774 has 16 divisors (see below), whose sum is σ = 1372800. Its totient is φ = 225720.

The previous prime is 681773. The next prime is 681781. The reversal of 681774 is 477186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909 + ... + 1479.

It is an arithmetic number, because the mean of its divisors is an integer number (85800).

2⁶⁸¹⁷⁷⁴ is an apocalyptic number.

681774 is an abundant number, since it is smaller than the sum of its proper divisors (691026).

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

681774 is a wasteful number, since it uses less digits than its factorization.

681774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775.

The product of its digits is 9408, while the sum is 33.

The square root of 681774 is about 825.6960699919. The cubic root of 681774 is about 88.0129973915.

The spelling of 681774 in words is "six hundred eighty-one thousand, seven hundred seventy-four".