81662 has 16 divisors (see below), whose sum is σ = 147840. Its totient is φ = 33048.

The previous prime is 81649. The next prime is 81667. The reversal of 81662 is 26618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113 + ... + 419.

It is an arithmetic number, because the mean of its divisors is an integer number (9240).

2⁸¹⁶⁶² is an apocalyptic number.

81662 is a deficient number, since it is larger than the sum of its proper divisors (66178).

81662 is a wasteful number, since it uses less digits than its factorization.

81662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335.

The product of its digits is 576, while the sum is 23.

The square root of 81662 is about 285.7656382422. The cubic root of 81662 is about 43.3850401837.

It can be divided in two parts, 816 and 62, that added together give a palindrome (878).

The spelling of 81662 in words is "eighty-one thousand, six hundred sixty-two".