56057557 has 4 divisors (see below), whose sum is σ = 56072800. Its totient is φ = 56042316.

The previous prime is 56057549. The next prime is 56057563. The reversal of 56057557 is 75575065.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 56057557 - 2³ = 56057549 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 (56057567) 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, 1678 + ... + 10720.

It is an arithmetic number, because the mean of its divisors is an integer number (14018200).

Almost surely, 2^56057557 is an apocalyptic number.

It is an amenable number.

56057557 is a deficient number, since it is larger than the sum of its proper divisors (15243).

56057557 is an equidigital number, since it uses as much as digits as its factorization.

56057557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15242.

The product of its (nonzero) digits is 183750, while the sum is 40.

The square root of 56057557 is about 7487.1594747274. The cubic root of 56057557 is about 382.7172661739.

The spelling of 56057557 in words is "fifty-six million, fifty-seven thousand, five hundred fifty-seven".