56557786 has 4 divisors (see below), whose sum is σ = 84836682. Its totient is φ = 28278892.

The previous prime is 56557769. The next prime is 56557789. The reversal of 56557786 is 68775565.

56557786 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: 68775565 = 5 ⋅13755113.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 2461761 = 7355^2 + 1569^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (56557789) 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 as a sum of consecutive naturals, namely, 14139445 + ... + 14139448.

Almost surely, 2^56557786 is an apocalyptic number.

56557786 is a deficient number, since it is larger than the sum of its proper divisors (28278896).

56557786 is a wasteful number, since it uses less digits than its factorization.

56557786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28278895.

The product of its digits is 1764000, while the sum is 49.

The square root of 56557786 is about 7520.4910743914. The cubic root of 56557786 is about 383.8522878415.

The spelling of 56557786 in words is "fifty-six million, five hundred fifty-seven thousand, seven hundred eighty-six".