56823621 has 4 divisors (see below), whose sum is σ = 75764832. Its totient is φ = 37882412.

The previous prime is 56823607. The next prime is 56823631. The reversal of 56823621 is 12632865.

56823621 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 56823621 - 2⁷ = 56823493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56823631) 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, 9470601 + ... + 9470606.

It is an arithmetic number, because the mean of its divisors is an integer number (18941208).

Almost surely, 2^56823621 is an apocalyptic number.

It is an amenable number.

56823621 is a deficient number, since it is larger than the sum of its proper divisors (18941211).

56823621 is a wasteful number, since it uses less digits than its factorization.

56823621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18941210.

The product of its digits is 17280, while the sum is 33.

The square root of 56823621 is about 7538.1444003150. The cubic root of 56823621 is about 384.4527469673.

The spelling of 56823621 in words is "fifty-six million, eight hundred twenty-three thousand, six hundred twenty-one".