581864 has 8 divisors (see below), whose sum is σ = 1091010. Its totient is φ = 290928.

The previous prime is 581863. The next prime is 581869. The reversal of 581864 is 468185.

581864 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in only one way, i.e., 372100 + 209764 = 610^2 + 458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 581864.

It is not an unprimeable number, because it can be changed into a prime (581863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36359 + ... + 36374.

2⁵⁸¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

581864 is a deficient number, since it is larger than the sum of its proper divisors (509146).

581864 is a wasteful number, since it uses less digits than its factorization.

581864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72739 (or 72735 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 581864 is about 762.8001048768. The cubic root of 581864 is about 83.4847522566.

The spelling of 581864 in words is "five hundred eighty-one thousand, eight hundred sixty-four".