56561784 has 64 divisors (see below), whose sum is σ = 155347200. Its totient is φ = 17081856.

The previous prime is 56561779. The next prime is 56561801. The reversal of 56561784 is 48716565.

56561784 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 an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7792 + ... + 13184.

It is an arithmetic number, because the mean of its divisors is an integer number (2427300).

Almost surely, 2^56561784 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 56561784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77673600).

56561784 is an abundant number, since it is smaller than the sum of its proper divisors (98785416).

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

56561784 is a wasteful number, since it uses less digits than its factorization.

56561784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444 (or 5440 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 56561784 is about 7520.7568768044. The cubic root of 56561784 is about 383.8613323097.

The spelling of 56561784 in words is "fifty-six million, five hundred sixty-one thousand, seven hundred eighty-four".