57785257 has 2 divisors, whose sum is σ = 57785258. Its totient is φ = 57785256.

The previous prime is 57785237. The next prime is 57785309. The reversal of 57785257 is 75258775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51108201 + 6677056 = 7149^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 57785257 - 2⁷ = 57785129 is a prime.

It is not a weakly prime, because it can be changed into another prime (57785207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28892628 + 28892629.

It is an arithmetic number, because the mean of its divisors is an integer number (28892629).

Almost surely, 2^57785257 is an apocalyptic number.

It is an amenable number.

57785257 is a deficient number, since it is larger than the sum of its proper divisors (1).

57785257 is an equidigital number, since it uses as much as digits as its factorization.

57785257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 686000, while the sum is 46.

The square root of 57785257 is about 7601.6614631276. The cubic root of 57785257 is about 386.6093470159.

The spelling of 57785257 in words is "fifty-seven million, seven hundred eighty-five thousand, two hundred fifty-seven".