56843781 has 4 divisors (see below), whose sum is σ = 75791712. Its totient is φ = 37895852.

The previous prime is 56843749. The next prime is 56843789. The reversal of 56843781 is 18734865.

56843781 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56843781 - 2⁵ = 56843749 is a prime.

It is a super-2 number, since 2×56843781² = 6462430876751922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56843789) 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, 9473961 + ... + 9473966.

It is an arithmetic number, because the mean of its divisors is an integer number (18947928).

Almost surely, 2^56843781 is an apocalyptic number.

It is an amenable number.

56843781 is a deficient number, since it is larger than the sum of its proper divisors (18947931).

56843781 is a wasteful number, since it uses less digits than its factorization.

56843781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18947930.

The product of its digits is 161280, while the sum is 42.

The square root of 56843781 is about 7539.4814808447. The cubic root of 56843781 is about 384.4982072345.

The spelling of 56843781 in words is "fifty-six million, eight hundred forty-three thousand, seven hundred eighty-one".