56322781 has 4 divisors (see below), whose sum is σ = 56347200. Its totient is φ = 56298364.

The previous prime is 56322731. The next prime is 56322793. The reversal of 56322781 is 18722365.

It is a happy number.

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 56322781 - 2⁹ = 56322269 is a prime.

It is a super-2 number, since 2×56322781² = 6344511319147922, 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 (56322731) 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 3 ways as a sum of consecutive naturals, for example, 8341 + ... + 13498.

It is an arithmetic number, because the mean of its divisors is an integer number (14086800).

Almost surely, 2^56322781 is an apocalyptic number.

It is an amenable number.

56322781 is a deficient number, since it is larger than the sum of its proper divisors (24419).

56322781 is a wasteful number, since it uses less digits than its factorization.

56322781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24418.

The product of its digits is 20160, while the sum is 34.

The square root of 56322781 is about 7504.8504981778. The cubic root of 56322781 is about 383.3198976177.

The spelling of 56322781 in words is "fifty-six million, three hundred twenty-two thousand, seven hundred eighty-one".