561504 has 24 divisors (see below), whose sum is σ = 1474200. Its totient is φ = 187136.

The previous prime is 561461. The next prime is 561521. The reversal of 561504 is 405165.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2829 + ... + 3020.

It is an arithmetic number, because the mean of its divisors is an integer number (61425).

2⁵⁶¹⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

561504 is an abundant number, since it is smaller than the sum of its proper divisors (912696).

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

561504 is a wasteful number, since it uses less digits than its factorization.

561504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862 (or 5854 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 561504 is about 749.3357058088. The cubic root of 561504 is about 82.4994306664.

Adding to 561504 its reverse (405165), we get a palindrome (966669).

The spelling of 561504 in words is "five hundred sixty-one thousand, five hundred four".