57656809 has 16 divisors (see below), whose sum is σ = 69987456. Its totient is φ = 46368000.

The previous prime is 57656789. The next prime is 57656821. The reversal of 57656809 is 90865675.

It is not a de Polignac number, because 57656809 - 2⁷ = 57656681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57656839) 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 15 ways as a sum of consecutive naturals, for example, 54334 + ... + 55384.

It is an arithmetic number, because the mean of its divisors is an integer number (4374216).

Almost surely, 2^57656809 is an apocalyptic number.

It is an amenable number.

57656809 is a deficient number, since it is larger than the sum of its proper divisors (12330647).

57656809 is a wasteful number, since it uses less digits than its factorization.

57656809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 57656809 is about 7593.2080835441. The cubic root of 57656809 is about 386.3226762139.

The spelling of 57656809 in words is "fifty-seven million, six hundred fifty-six thousand, eight hundred nine".