57705221 has 4 divisors (see below), whose sum is σ = 65948832. Its totient is φ = 49461612.

The previous prime is 57705217. The next prime is 57705227. The reversal of 57705221 is 12250775.

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 57705221 - 2² = 57705217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57705227) 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, 4121795 + ... + 4121808.

It is an arithmetic number, because the mean of its divisors is an integer number (16487208).

Almost surely, 2^57705221 is an apocalyptic number.

It is an amenable number.

57705221 is a deficient number, since it is larger than the sum of its proper divisors (8243611).

57705221 is an equidigital number, since it uses as much as digits as its factorization.

57705221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8243610.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 57705221 is about 7596.3952635444. The cubic root of 57705221 is about 386.4307722715.

Adding to 57705221 its reverse (12250775), we get a palindrome (69955996).

The spelling of 57705221 in words is "fifty-seven million, seven hundred five thousand, two hundred twenty-one".