81487 has 6 divisors (see below), whose sum is σ = 94848. Its totient is φ = 69804.

The previous prime is 81463. The next prime is 81509. The reversal of 81487 is 78418.

It is not a de Polignac number, because 81487 - 2⁷ = 81359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81457) 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 5 ways as a sum of consecutive naturals, for example, 783 + ... + 880.

It is an arithmetic number, because the mean of its divisors is an integer number (15808).

2⁸¹⁴⁸⁷ is an apocalyptic number.

81487 is a deficient number, since it is larger than the sum of its proper divisors (13361).

81487 is a wasteful number, since it uses less digits than its factorization.

81487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677 (or 1670 counting only the distinct ones).

The product of its digits is 1792, while the sum is 28.

The square root of 81487 is about 285.4592790575. The cubic root of 81487 is about 43.3540269342.

The spelling of 81487 in words is "eighty-one thousand, four hundred eighty-seven".