56809721680 has 40 divisors (see below), whose sum is σ = 136637181000. Its totient is φ = 21940305408.

The previous prime is 56809721653. The next prime is 56809721681. The reversal of 56809721680 is 8612790865.

It can be written as a sum of positive squares in 4 ways, for example, as 306530064 + 56503191616 = 17508^2 + 237704^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56809721681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12241155 + ... + 12245794.

It is an arithmetic number, because the mean of its divisors is an integer number (3415929525).

Almost surely, 2^56809721680 is an apocalyptic number.

It is an amenable number.

56809721680 is an abundant number, since it is smaller than the sum of its proper divisors (79827459320).

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

56809721680 is a wasteful number, since it uses less digits than its factorization.

56809721680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24486991 (or 24486985 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 56809721680 in words is "fifty-six billion, eight hundred nine million, seven hundred twenty-one thousand, six hundred eighty".