561340120 has 64 divisors (see below), whose sum is σ = 1381847040. Its totient is φ = 203529600.

The previous prime is 561340049. The next prime is 561340121. The reversal of 561340120 is 21043165.

It is a super-2 number, since 2×561340120² = 630205460643228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 561340091 and 561340100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561340121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166855 + ... + 170185.

It is an arithmetic number, because the mean of its divisors is an integer number (21591360).

Almost surely, 2^561340120 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 561340120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690923520).

561340120 is an abundant number, since it is smaller than the sum of its proper divisors (820506920).

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

561340120 is a wasteful number, since it uses less digits than its factorization.

561340120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736 (or 3732 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 561340120 is about 23692.6174155580. The cubic root of 561340120 is about 824.9140381815.

Adding to 561340120 its reverse (21043165), we get a palindrome (582383285).

The spelling of 561340120 in words is "five hundred sixty-one million, three hundred forty thousand, one hundred twenty".