561560220 has 144 divisors (see below), whose sum is σ = 1877427552. Its totient is φ = 134991360.

The previous prime is 561560213. The next prime is 561560221. The reversal of 561560220 is 22065165.

561560220 is a `hidden beast` number, since 56 + 1 + 5 + 602 + 2 + 0 = 666.

561560220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561560221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97830 + ... + 103410.

Almost surely, 2^561560220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561560220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938713776).

561560220 is an abundant number, since it is smaller than the sum of its proper divisors (1315867332).

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

561560220 is a wasteful number, since it uses less digits than its factorization.

561560220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5652 (or 5647 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 561560220 is about 23697.2618671441. The cubic root of 561560220 is about 825.0218396422.

The spelling of 561560220 in words is "five hundred sixty-one million, five hundred sixty thousand, two hundred twenty".