561806784 has 336 divisors, whose sum is σ = 2054108160. Its totient is φ = 142571520.

The previous prime is 561806753. The next prime is 561806797. The reversal of 561806784 is 487608165.

It is a happy number.

561806784 is a `hidden beast` number, since 561 + 8 + 0 + 6 + 7 + 84 = 666.

561806784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2350537 + ... + 2350775.

Almost surely, 2^561806784 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 561806784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027054080).

561806784 is an abundant number, since it is smaller than the sum of its proper divisors (1492301376).

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

561806784 is a wasteful number, since it uses less digits than its factorization.

561806784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 561806784 is about 23702.4636694163. The cubic root of 561806784 is about 825.1425693004.

The spelling of 561806784 in words is "five hundred sixty-one million, eight hundred six thousand, seven hundred eighty-four".