56782721 has 8 divisors (see below), whose sum is σ = 58976640. Its totient is φ = 54629968.

The previous prime is 56782717. The next prime is 56782729. The reversal of 56782721 is 12728765.

56782721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56782721 - 2² = 56782717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56782729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7466 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (7372080).

Almost surely, 2^56782721 is an apocalyptic number.

It is an amenable number.

56782721 is a deficient number, since it is larger than the sum of its proper divisors (2193919).

56782721 is a wasteful number, since it uses less digits than its factorization.

56782721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20583.

The product of its digits is 47040, while the sum is 38.

The square root of 56782721 is about 7535.4310427473. The cubic root of 56782721 is about 384.3604855030.

The spelling of 56782721 in words is "fifty-six million, seven hundred eighty-two thousand, seven hundred twenty-one".