56705781 has 8 divisors (see below), whose sum is σ = 82481184. Its totient is φ = 34367120.

The previous prime is 56705771. The next prime is 56705791. The reversal of 56705781 is 18750765.

56705781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (56705771) and next prime (56705791).

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 56705781 - 2⁵ = 56705749 is a prime.

It is a super-2 number, since 2×56705781² = 6431091197639922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56705771) 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, 859146 + ... + 859211.

It is an arithmetic number, because the mean of its divisors is an integer number (10310148).

Almost surely, 2^56705781 is an apocalyptic number.

It is an amenable number.

56705781 is a deficient number, since it is larger than the sum of its proper divisors (25775403).

56705781 is a wasteful number, since it uses less digits than its factorization.

56705781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718371.

The product of its (nonzero) digits is 58800, while the sum is 39.

The square root of 56705781 is about 7530.3240966110. The cubic root of 56705781 is about 384.1868055396.

The spelling of 56705781 in words is "fifty-six million, seven hundred five thousand, seven hundred eighty-one".