57728537 has 2 divisors, whose sum is σ = 57728538. Its totient is φ = 57728536.

The previous prime is 57728521. The next prime is 57728579. The reversal of 57728537 is 73582775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57441241 + 287296 = 7579^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 57728537 - 2⁴ = 57728521 is a prime.

It is not a weakly prime, because it can be changed into another prime (57428537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28864268 + 28864269.

It is an arithmetic number, because the mean of its divisors is an integer number (28864269).

Almost surely, 2^57728537 is an apocalyptic number.

It is an amenable number.

57728537 is a deficient number, since it is larger than the sum of its proper divisors (1).

57728537 is an equidigital number, since it uses as much as digits as its factorization.

57728537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 411600, while the sum is 44.

The square root of 57728537 is about 7597.9297838293. The cubic root of 57728537 is about 386.4828115064.

The spelling of 57728537 in words is "fifty-seven million, seven hundred twenty-eight thousand, five hundred thirty-seven".