28730057 has 2 divisors, whose sum is σ = 28730058. Its totient is φ = 28730056.

The previous prime is 28730047. The next prime is 28730077. The reversal of 28730057 is 75003782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17547721 + 11182336 = 4189^2 + 3344^2 .

It is a cyclic number.

It is not a de Polignac number, because 28730057 - 2⁶ = 28729993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28730047) 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, 14365028 + 14365029.

It is an arithmetic number, because the mean of its divisors is an integer number (14365029).

Almost surely, 2^28730057 is an apocalyptic number.

It is an amenable number.

28730057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28730057 is an equidigital number, since it uses as much as digits as its factorization.

28730057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 28730057 is about 5360.0426304275. The cubic root of 28730057 is about 306.2754330121.

The spelling of 28730057 in words is "twenty-eight million, seven hundred thirty thousand, fifty-seven".