56781005 has 4 divisors (see below), whose sum is σ = 68137212. Its totient is φ = 45424800.

The previous prime is 56781001. The next prime is 56781019. The reversal of 56781005 is 50018765.

56781005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25989604 + 30791401 = 5098^2 + 5549^2 .

It is not a de Polignac number, because 56781005 - 2² = 56781001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56781001) 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 3 ways as a sum of consecutive naturals, for example, 5678096 + ... + 5678105.

It is an arithmetic number, because the mean of its divisors is an integer number (17034303).

Almost surely, 2^56781005 is an apocalyptic number.

It is an amenable number.

56781005 is a deficient number, since it is larger than the sum of its proper divisors (11356207).

56781005 is a wasteful number, since it uses less digits than its factorization.

56781005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11356206.

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

The square root of 56781005 is about 7535.3171797875. The cubic root of 56781005 is about 384.3566136136.

The spelling of 56781005 in words is "fifty-six million, seven hundred eighty-one thousand, five".