56005781 has 8 divisors (see below), whose sum is σ = 60587520. Its totient is φ = 51463152.

The previous prime is 56005777. The next prime is 56005801. The reversal of 56005781 is 18750065.

56005781 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 not a de Polignac number, because 56005781 - 2² = 56005777 is a prime.

It is a super-2 number, since 2×56005781² = 6273295010839922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56005751) 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, 6761 + ... + 12558.

It is an arithmetic number, because the mean of its divisors is an integer number (7573440).

Almost surely, 2^56005781 is an apocalyptic number.

It is an amenable number.

56005781 is a deficient number, since it is larger than the sum of its proper divisors (4581739).

56005781 is a wasteful number, since it uses less digits than its factorization.

56005781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19555.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 56005781 is about 7483.7010228897. The cubic root of 56005781 is about 382.5994011672.

The spelling of 56005781 in words is "fifty-six million, five thousand, seven hundred eighty-one".