561325720 has 32 divisors (see below), whose sum is σ = 1337277600. Its totient is φ = 211322368.

The previous prime is 561325717. The next prime is 561325729. The reversal of 561325720 is 27523165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561325729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412060 + ... + 413419.

It is an arithmetic number, because the mean of its divisors is an integer number (41789925).

Almost surely, 2^561325720 is an apocalyptic number.

It is an amenable number.

561325720 is an abundant number, since it is smaller than the sum of its proper divisors (775951880).

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

561325720 is a wasteful number, since it uses less digits than its factorization.

561325720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825507 (or 825503 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 561325720 is about 23692.3135214778. The cubic root of 561325720 is about 824.9069843097.

Adding to 561325720 its reverse (27523165), we get a palindrome (588848885).

The spelling of 561325720 in words is "five hundred sixty-one million, three hundred twenty-five thousand, seven hundred twenty".