57728917 has 4 divisors (see below), whose sum is σ = 59289196. Its totient is φ = 56168640.

The previous prime is 57728857. The next prime is 57728947. The reversal of 57728917 is 71982775.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29149201 + 28579716 = 5399^2 + 5346^2 .

It is a cyclic number.

It is not a de Polignac number, because 57728917 - 2²³ = 49340309 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 (57728947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780084 + ... + 780157.

It is an arithmetic number, because the mean of its divisors is an integer number (14822299).

Almost surely, 2^57728917 is an apocalyptic number.

It is an amenable number.

57728917 is a deficient number, since it is larger than the sum of its proper divisors (1560279).

57728917 is a wasteful number, since it uses less digits than its factorization.

57728917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560278.

The product of its digits is 246960, while the sum is 46.

The square root of 57728917 is about 7597.9547905999. The cubic root of 57728917 is about 386.4836595165.

The spelling of 57728917 in words is "fifty-seven million, seven hundred twenty-eight thousand, nine hundred seventeen".