57308729 has 2 divisors, whose sum is σ = 57308730. Its totient is φ = 57308728.

The previous prime is 57308639. The next prime is 57308737. The reversal of 57308729 is 92780375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55472704 + 1836025 = 7448^2 + 1355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57308729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57308789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28654364 + 28654365.

It is an arithmetic number, because the mean of its divisors is an integer number (28654365).

Almost surely, 2^57308729 is an apocalyptic number.

It is an amenable number.

57308729 is a deficient number, since it is larger than the sum of its proper divisors (1).

57308729 is an equidigital number, since it uses as much as digits as its factorization.

57308729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 57308729 is about 7570.2529019842. The cubic root of 57308729 is about 385.5436834338.

The spelling of 57308729 in words is "fifty-seven million, three hundred eight thousand, seven hundred twenty-nine".