681884 has 30 divisors (see below), whose sum is σ = 1411704. Its totient is φ = 288120.

The previous prime is 681883. The next prime is 681899. The reversal of 681884 is 488186.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681883) 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 9 ways as a sum of consecutive naturals, for example, 9569 + ... + 9639.

2⁶⁸¹⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705852).

681884 is an abundant number, since it is smaller than the sum of its proper divisors (729820).

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

681884 is an equidigital number, since it uses as much as digits as its factorization.

681884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 80 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The square root of 681884 is about 825.7626777713. The cubic root of 681884 is about 88.0177305871.

The spelling of 681884 in words is "six hundred eighty-one thousand, eight hundred eighty-four".