81734 has 4 divisors (see below), whose sum is σ = 122604. Its totient is φ = 40866.

The previous prime is 81727. The next prime is 81737. The reversal of 81734 is 43718.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43718 = 2 ⋅21859.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20432 + ... + 20435.

It is an arithmetic number, because the mean of its divisors is an integer number (30651).

2⁸¹⁷³⁴ is an apocalyptic number.

81734 is a deficient number, since it is larger than the sum of its proper divisors (40870).

81734 is a wasteful number, since it uses less digits than its factorization.

81734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40869.

The product of its digits is 672, while the sum is 23.

The square root of 81734 is about 285.8915878441. The cubic root of 81734 is about 43.3977870561.

The spelling of 81734 in words is "eighty-one thousand, seven hundred thirty-four".