81726 has 16 divisors (see below), whose sum is σ = 167184. Its totient is φ = 26624.

The previous prime is 81707. The next prime is 81727. The reversal of 81726 is 62718.

81726 = 29² + 30² + ... + 64².

It is a junction number, because it is equal to n+sod(n) for n = 81696 and 81705.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81726.

It is not an unprimeable number, because it can be changed into a prime (81727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190 + ... + 446.

It is an arithmetic number, because the mean of its divisors is an integer number (10449).

2⁸¹⁷²⁶ is an apocalyptic number.

81726 is an abundant number, since it is smaller than the sum of its proper divisors (85458).

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 (83592).

81726 is a wasteful number, since it uses less digits than its factorization.

81726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315.

The product of its digits is 672, while the sum is 24.

The square root of 81726 is about 285.8775961841. The cubic root of 81726 is about 43.3963711067.

The spelling of 81726 in words is "eighty-one thousand, seven hundred twenty-six".