56561856 has 224 divisors, whose sum is σ = 180246528. Its totient is φ = 15482880.

The previous prime is 56561851. The next prime is 56561891. The reversal of 56561856 is 65816565.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (56561851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1315371 + ... + 1315413.

It is an arithmetic number, because the mean of its divisors is an integer number (804672).

Almost surely, 2^56561856 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 56561856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90123264).

56561856 is an abundant number, since it is smaller than the sum of its proper divisors (123684672).

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

56561856 is a wasteful number, since it uses less digits than its factorization.

56561856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 109 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The square root of 56561856 is about 7520.7616635551. The cubic root of 56561856 is about 383.8614951876.

The spelling of 56561856 in words is "fifty-six million, five hundred sixty-one thousand, eight hundred fifty-six".