81966 has 16 divisors (see below), whose sum is σ = 172800. Its totient is φ = 25848.
The previous prime is 81953. The next prime is 81967. The reversal of 81966 is 66918.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (81967) 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, 246 + ... + 473.
It is an arithmetic number, because the mean of its divisors is an integer number (10800).
281966 is an apocalyptic number.
81966 is an abundant number, since it is smaller than the sum of its proper divisors (90834).
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 (86400).
81966 is a wasteful number, since it uses less digits than its factorization.
81966 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 743.
The product of its digits is 2592, while the sum is 30.
The square root of 81966 is about 286.2970485353. The cubic root of 81966 is about 43.4388094597.
The spelling of 81966 in words is "eighty-one thousand, nine hundred sixty-six".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.066 sec. • engine limits •