81654 has 16 divisors (see below), whose sum is σ = 168960. Its totient is φ = 26280.

The previous prime is 81649. The next prime is 81667. The reversal of 81654 is 45618.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34 + ... + 405.

It is an arithmetic number, because the mean of its divisors is an integer number (10560).

2⁸¹⁶⁵⁴ is an apocalyptic number.

81654 is an abundant number, since it is smaller than the sum of its proper divisors (87306).

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 (84480).

81654 is a wasteful number, since it uses less digits than its factorization.

81654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475.

The product of its digits is 960, while the sum is 24.

The square root of 81654 is about 285.7516404152. The cubic root of 81654 is about 43.3836234021.

The spelling of 81654 in words is "eighty-one thousand, six hundred fifty-four".