81802 has 8 divisors (see below), whose sum is σ = 140256. Its totient is φ = 35052.

The previous prime is 81799. The next prime is 81817. The reversal of 81802 is 20818.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2908 + ... + 2935.

It is an arithmetic number, because the mean of its divisors is an integer number (17532).

2⁸¹⁸⁰² is an apocalyptic number.

81802 is a deficient number, since it is larger than the sum of its proper divisors (58454).

81802 is a wasteful number, since it uses less digits than its factorization.

81802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5852.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 81802 is about 286.0104893181. The cubic root of 81802 is about 43.4098188973.

The spelling of 81802 in words is "eighty-one thousand, eight hundred two".