57709387 has 2 divisors, whose sum is σ = 57709388. Its totient is φ = 57709386.

The previous prime is 57709361. The next prime is 57709409. The reversal of 57709387 is 78390775.

It is a happy number.

57709387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57709387 is a prime.

It is not a weakly prime, because it can be changed into another prime (57709187) 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 as a sum of consecutive naturals, namely, 28854693 + 28854694.

It is an arithmetic number, because the mean of its divisors is an integer number (28854694).

Almost surely, 2^57709387 is an apocalyptic number.

57709387 is a deficient number, since it is larger than the sum of its proper divisors (1).

57709387 is an equidigital number, since it uses as much as digits as its factorization.

57709387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 57709387 is about 7596.6694676022. The cubic root of 57709387 is about 386.4400714408.

It can be divided in two parts, 5770938 and 7, that multiplied together give a triangular number (40396566 = T₈₉₈₈).

The spelling of 57709387 in words is "fifty-seven million, seven hundred nine thousand, three hundred eighty-seven".