561310820 has 48 divisors (see below), whose sum is σ = 1378489728. Its totient is φ = 187971840.

The previous prime is 561310819. The next prime is 561310909. The reversal of 561310820 is 28013165.

It is a self number, because there is not a number n which added to its sum of digits gives 561310820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40601 + ... + 52640.

It is an arithmetic number, because the mean of its divisors is an integer number (28718536).

Almost surely, 2^561310820 is an apocalyptic number.

It is an amenable number.

561310820 is an abundant number, since it is smaller than the sum of its proper divisors (817178908).

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

561310820 is a wasteful number, since it uses less digits than its factorization.

561310820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93300 (or 93298 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 561310820 is about 23691.9990714165. Note that the first 3 decimals coincide. The cubic root of 561310820 is about 824.8996853848.

Adding to 561310820 its reverse (28013165), we get a palindrome (589323985).

The spelling of 561310820 in words is "five hundred sixty-one million, three hundred ten thousand, eight hundred twenty".