64581 has 16 divisors (see below), whose sum is σ = 99840. Its totient is φ = 36720.

The previous prime is 64579. The next prime is 64591. The reversal of 64581 is 18546.

It is not a de Polignac number, because 64581 - 2¹ = 64579 is a prime.

It is a super-2 number, since 2×64581² = 8341411122, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64581.

It is not an unprimeable number, because it can be changed into a prime (64591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576 + ... + 678.

It is an arithmetic number, because the mean of its divisors is an integer number (6240).

2⁶⁴⁵⁸¹ is an apocalyptic number.

It is an amenable number.

64581 is a deficient number, since it is larger than the sum of its proper divisors (35259).

64581 is a wasteful number, since it uses less digits than its factorization.

64581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136.

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

The square root of 64581 is about 254.1279205440. The cubic root of 64581 is about 40.1206772257.

The spelling of 64581 in words is "sixty-four thousand, five hundred eighty-one".