561604 has 6 divisors (see below), whose sum is σ = 982814. Its totient is φ = 280800.

The previous prime is 561599. The next prime is 561607. The reversal of 561604 is 406165.

It can be written as a sum of positive squares in only one way, i.e., 313600 + 248004 = 560^2 + 498^2 .

It is not an unprimeable number, because it can be changed into a prime (561607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70197 + ... + 70204.

2⁵⁶¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

561604 is a deficient number, since it is larger than the sum of its proper divisors (421210).

561604 is a wasteful number, since it uses less digits than its factorization.

561604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140405 (or 140403 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 561604 is about 749.4024286056. The cubic root of 561604 is about 82.5043279027.

Adding to 561604 its reverse (406165), we get a palindrome (967769).

The spelling of 561604 in words is "five hundred sixty-one thousand, six hundred four".