81704 has 16 divisors (see below), whose sum is σ = 175200. Its totient is φ = 34992.

The previous prime is 81703. The next prime is 81707. The reversal of 81704 is 40718.

It is a happy number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81704.

It is not an unprimeable number, because it can be changed into a prime (81701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 674 + ... + 785.

It is an arithmetic number, because the mean of its divisors is an integer number (10950).

2⁸¹⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

81704 is an abundant number, since it is smaller than the sum of its proper divisors (93496).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87600).

81704 is a wasteful number, since it uses less digits than its factorization.

81704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472 (or 1468 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 81704 is about 285.8391155878. The cubic root of 81704 is about 43.3924767694.

The spelling of 81704 in words is "eighty-one thousand, seven hundred four".