57660749 has 2 divisors, whose sum is σ = 57660750. Its totient is φ = 57660748.

The previous prime is 57660731. The next prime is 57660769. The reversal of 57660749 is 94706675.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 6538249 = 7150^2 + 2557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57660749 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57660769) 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 as a sum of consecutive naturals, namely, 28830374 + 28830375.

It is an arithmetic number, because the mean of its divisors is an integer number (28830375).

Almost surely, 2^57660749 is an apocalyptic number.

It is an amenable number.

57660749 is a deficient number, since it is larger than the sum of its proper divisors (1).

57660749 is an equidigital number, since it uses as much as digits as its factorization.

57660749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 57660749 is about 7593.4675214950. The cubic root of 57660749 is about 386.3314758492.

The spelling of 57660749 in words is "fifty-seven million, six hundred sixty thousand, seven hundred forty-nine".