81896 has 16 divisors (see below), whose sum is σ = 159300. Its totient is φ = 39424.

The previous prime is 81883. The next prime is 81899. The reversal of 81896 is 69818.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 100 = 286^2 + 10^2 .

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

Its product of digits (3456) is a multiple of the sum of its prime divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81899) by changing a digit.

81896 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 56 + ... + 408.

2⁸¹⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

81896 is a deficient number, since it is larger than the sum of its proper divisors (77404).

81896 is a wasteful number, since it uses less digits than its factorization.

81896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 384 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The square root of 81896 is about 286.1747717742. The cubic root of 81896 is about 43.4264401737.

The spelling of 81896 in words is "eighty-one thousand, eight hundred ninety-six".