57807221 has 4 divisors (see below), whose sum is σ = 57875532. Its totient is φ = 57738912.

The previous prime is 57807203. The next prime is 57807229. The reversal of 57807221 is 12270875.

57807221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27447121 + 30360100 = 5239^2 + 5510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57807221 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 (57807229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32870 + ... + 34583.

It is an arithmetic number, because the mean of its divisors is an integer number (14468883).

Almost surely, 2^57807221 is an apocalyptic number.

It is an amenable number.

57807221 is a deficient number, since it is larger than the sum of its proper divisors (68311).

57807221 is an equidigital number, since it uses as much as digits as its factorization.

57807221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68310.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 57807221 is about 7603.1060100462. The cubic root of 57807221 is about 386.6583238225.

The spelling of 57807221 in words is "fifty-seven million, eight hundred seven thousand, two hundred twenty-one".