561330540 has 96 divisors (see below), whose sum is σ = 1775094720. Its totient is φ = 147225600.

The previous prime is 561330439. The next prime is 561330569. The reversal of 561330540 is 45033165.

561330540 is a `hidden beast` number, since 5 + 613 + 3 + 0 + 5 + 40 = 666.

561330540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24420 + ... + 41460.

It is an arithmetic number, because the mean of its divisors is an integer number (18490570).

Almost surely, 2^561330540 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 561330540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887547360).

561330540 is an abundant number, since it is smaller than the sum of its proper divisors (1213764180).

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

561330540 is a wasteful number, since it uses less digits than its factorization.

561330540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17120 (or 17112 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 561330540 is about 23692.4152420136. The cubic root of 561330540 is about 824.9093454107.

The spelling of 561330540 in words is "five hundred sixty-one million, three hundred thirty thousand, five hundred forty".