561357820 has 12 divisors (see below), whose sum is σ = 1178851464. Its totient is φ = 224543120.

The previous prime is 561357791. The next prime is 561357829. The reversal of 561357820 is 28753165.

It is a self number, because there is not a number n which added to its sum of digits gives 561357820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561357829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14033926 + ... + 14033965.

It is an arithmetic number, because the mean of its divisors is an integer number (98237622).

Almost surely, 2^561357820 is an apocalyptic number.

It is an amenable number.

561357820 is an abundant number, since it is smaller than the sum of its proper divisors (617493644).

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

561357820 is a wasteful number, since it uses less digits than its factorization.

561357820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28067900 (or 28067898 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 561357820 is about 23692.9909466914. The cubic root of 561357820 is about 824.9227084003.

The spelling of 561357820 in words is "five hundred sixty-one million, three hundred fifty-seven thousand, eight hundred twenty".