56865781 has 32 divisors (see below), whose sum is σ = 70698240. Its totient is φ = 44706816.

The previous prime is 56865773. The next prime is 56865791. The reversal of 56865781 is 18756865.

It is not a de Polignac number, because 56865781 - 2³ = 56865773 is a prime.

It is a super-2 number, since 2×56865781² = 6467434097479922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 56865781 parts by 10664 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56865761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 503181 + ... + 503293.

It is an arithmetic number, because the mean of its divisors is an integer number (2209320).

Almost surely, 2^56865781 is an apocalyptic number.

It is an amenable number.

56865781 is a deficient number, since it is larger than the sum of its proper divisors (13832459).

56865781 is a wasteful number, since it uses less digits than its factorization.

56865781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253.

The product of its digits is 403200, while the sum is 46.

The square root of 56865781 is about 7540.9403259806. The cubic root of 56865781 is about 384.5478043899.

The spelling of 56865781 in words is "fifty-six million, eight hundred sixty-five thousand, seven hundred eighty-one".