561630 has 32 divisors (see below), whose sum is σ = 1368864. Its totient is φ = 147456.

The previous prime is 561607. The next prime is 561667. The reversal of 561630 is 36165.

561630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 561597 and 561606.

It is a congruent number.

It is an unprimeable number.

561630 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 15 ways as a sum of consecutive naturals, for example, 2814 + ... + 3006.

It is an arithmetic number, because the mean of its divisors is an integer number (42777).

2⁵⁶¹⁶³⁰ is an apocalyptic number.

561630 is an abundant number, since it is smaller than the sum of its proper divisors (807234).

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

561630 is a wasteful number, since it uses less digits than its factorization.

561630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 561630 is about 749.4197755597. The cubic root of 561630 is about 82.5056010890.

Adding to 561630 its reverse (36165), we get a palindrome (597795).

The spelling of 561630 in words is "five hundred sixty-one thousand, six hundred thirty".