56557557 has 24 divisors (see below), whose sum is σ = 93562560. Its totient is φ = 32250240.

The previous prime is 56557549. The next prime is 56557559. The reversal of 56557557 is 75575565.

It is not a de Polignac number, because 56557557 - 2³ = 56557549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56557559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54994 + ... + 56012.

It is an arithmetic number, because the mean of its divisors is an integer number (3898440).

Almost surely, 2^56557557 is an apocalyptic number.

It is an amenable number.

56557557 is a deficient number, since it is larger than the sum of its proper divisors (37005003).

56557557 is a wasteful number, since it uses less digits than its factorization.

56557557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1910 counting only the distinct ones).

The product of its digits is 918750, while the sum is 45.

The square root of 56557557 is about 7520.4758493063. The cubic root of 56557557 is about 383.8517697738.

The spelling of 56557557 in words is "fifty-six million, five hundred fifty-seven thousand, five hundred fifty-seven".