81876 has 12 divisors (see below), whose sum is σ = 191072. Its totient is φ = 27288.

The previous prime is 81869. The next prime is 81883. The reversal of 81876 is 67818.

It is an interprime number because it is at equal distance from previous prime (81869) and next prime (81883).

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400 + ... + 3423.

2⁸¹⁸⁷⁶ is an apocalyptic number.

It is an amenable number.

81876 is an abundant number, since it is smaller than the sum of its proper divisors (109196).

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 (95536).

81876 is a wasteful number, since it uses less digits than its factorization.

81876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6830 (or 6828 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 81876 is about 286.1398259593. The cubic root of 81876 is about 43.4229047975.

The spelling of 81876 in words is "eighty-one thousand, eight hundred seventy-six".