581604 has 24 divisors (see below), whose sum is σ = 1437408. Its totient is φ = 182400.

The previous prime is 581599. The next prime is 581617. The reversal of 581604 is 406185.

It is an Ulam number.

It is an unprimeable number.

581604 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222 + ... + 1629.

It is an arithmetic number, because the mean of its divisors is an integer number (59892).

2⁵⁸¹⁶⁰⁴ is an apocalyptic number.

581604 is the 408-th nonagonal number.

It is an amenable number.

581604 is an abundant number, since it is smaller than the sum of its proper divisors (855804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

581604 is a wasteful number, since it uses less digits than its factorization.

581604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875 (or 2873 counting only the distinct ones).

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

The square root of 581604 is about 762.6296611069. The cubic root of 581604 is about 83.4723156337.

Subtracting from 581604 its product of nonzero digits (960), we obtain a square (580644 = 762²).

Adding to 581604 its reverse (406185), we get a palindrome (987789).

The spelling of 581604 in words is "five hundred eighty-one thousand, six hundred four".