81763 has 4 divisors (see below), whose sum is σ = 89208. Its totient is φ = 74320.

The previous prime is 81761. The next prime is 81769. The reversal of 81763 is 36718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81763 - 2¹ = 81761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81761) by changing a digit.

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, 3706 + ... + 3727.

It is an arithmetic number, because the mean of its divisors is an integer number (22302).

2⁸¹⁷⁶³ is an apocalyptic number.

81763 is a deficient number, since it is larger than the sum of its proper divisors (7445).

81763 is a wasteful number, since it uses less digits than its factorization.

81763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7444.

The product of its digits is 1008, while the sum is 25.

The square root of 81763 is about 285.9423018722. The cubic root of 81763 is about 43.4029190983.

It can be divided in two parts, 8 and 1763, that added together give a palindrome (1771).

The spelling of 81763 in words is "eighty-one thousand, seven hundred sixty-three".