82861 has 8 divisors (see below), whose sum is σ = 88704. Its totient is φ = 77280.

The previous prime is 82847. The next prime is 82883. The reversal of 82861 is 16828.

82861 is nontrivially palindromic in base 6.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82861 - 2⁹ = 82349 is a prime.

It is an Ulam number.

It is a Duffinian number.

82861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82811) 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, 1740 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (11088).

2⁸²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

82861 is a deficient number, since it is larger than the sum of its proper divisors (5843).

82861 is a wasteful number, since it uses less digits than its factorization.

82861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131.

The product of its digits is 768, while the sum is 25.

The square root of 82861 is about 287.8558667111. The cubic root of 82861 is about 43.5963425936.

The spelling of 82861 in words is "eighty-two thousand, eight hundred sixty-one".