57257213 has 8 divisors (see below), whose sum is σ = 62208888. Its totient is φ = 52383744.

The previous prime is 57257183. The next prime is 57257219. The reversal of 57257213 is 31275275.

It can be written as a sum of positive squares in 4 ways, for example, as 8508889 + 48748324 = 2917^2 + 6982^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57257213 - 2¹⁴ = 57240829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57257213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57257219) 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 7 ways as a sum of consecutive naturals, for example, 18020 + ... + 20957.

It is an arithmetic number, because the mean of its divisors is an integer number (7776111).

Almost surely, 2^57257213 is an apocalyptic number.

It is an amenable number.

57257213 is a deficient number, since it is larger than the sum of its proper divisors (4951675).

57257213 is a wasteful number, since it uses less digits than its factorization.

57257213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39103.

The product of its digits is 14700, while the sum is 32.

The square root of 57257213 is about 7566.8496086548. The cubic root of 57257213 is about 385.4281244077.

The spelling of 57257213 in words is "fifty-seven million, two hundred fifty-seven thousand, two hundred thirteen".