81676 has 12 divisors (see below), whose sum is σ = 163408. Its totient is φ = 34992.

The previous prime is 81671. The next prime is 81677. The reversal of 81676 is 67618.

81676 = 105² + 106² + ... + 111².

81676 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 2917 = 81676 / (8 + 1 + 6 + 7 + 6).

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

It is not an unprimeable number, because it can be changed into a prime (81671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431 + ... + 1486.

2⁸¹⁶⁷⁶ is an apocalyptic number.

It is an amenable number.

81676 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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 (81704).

81676 is a wasteful number, since it uses less digits than its factorization.

81676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928 (or 2926 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 81676 is about 285.7901327898. The cubic root of 81676 is about 43.3875193288.

It can be divided in two parts, 81 and 676, that multiplied together give a square (54756 = 234²).

The spelling of 81676 in words is "eighty-one thousand, six hundred seventy-six".