56776021 has 4 divisors (see below), whose sum is σ = 58160844. Its totient is φ = 55391200.

The previous prime is 56775989. The next prime is 56776043. The reversal of 56776021 is 12067765.

56776021 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 an emirpimes, since its reverse is a distinct semiprime: 12067765 = 5 ⋅2413553.

It can be written as a sum of positive squares in 2 ways, for example, as 26635921 + 30140100 = 5161^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 56776021 - 2⁵ = 56775989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56771021) 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, 692350 + ... + 692431.

It is an arithmetic number, because the mean of its divisors is an integer number (14540211).

Almost surely, 2^56776021 is an apocalyptic number.

It is an amenable number.

56776021 is a deficient number, since it is larger than the sum of its proper divisors (1384823).

56776021 is a wasteful number, since it uses less digits than its factorization.

56776021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384822.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 56776021 is about 7534.9864631597. The cubic root of 56776021 is about 384.3453675440.

The spelling of 56776021 in words is "fifty-six million, seven hundred seventy-six thousand, twenty-one".