57257709 has 4 divisors (see below), whose sum is σ = 76343616. Its totient is φ = 38171804.

The previous prime is 57257701. The next prime is 57257749. The reversal of 57257709 is 90775275.

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.

It is a cyclic number.

It is not a de Polignac number, because 57257709 - 2³ = 57257701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57257701) 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, 9542949 + ... + 9542954.

It is an arithmetic number, because the mean of its divisors is an integer number (19085904).

Almost surely, 2^57257709 is an apocalyptic number.

It is an amenable number.

57257709 is a deficient number, since it is larger than the sum of its proper divisors (19085907).

57257709 is a wasteful number, since it uses less digits than its factorization.

57257709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085906.

The product of its (nonzero) digits is 154350, while the sum is 42.

The square root of 57257709 is about 7566.8823831219. The cubic root of 57257709 is about 385.4292373493.

The spelling of 57257709 in words is "fifty-seven million, two hundred fifty-seven thousand, seven hundred nine".