28357057 has 2 divisors, whose sum is σ = 28357058. Its totient is φ = 28357056.

The previous prime is 28357019. The next prime is 28357073. The reversal of 28357057 is 75075382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 7890481 = 4524^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 28357057 - 2⁷ = 28356929 is a prime.

It is not a weakly prime, because it can be changed into another prime (28357457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178528 + 14178529.

It is an arithmetic number, because the mean of its divisors is an integer number (14178529).

Almost surely, 2^28357057 is an apocalyptic number.

It is an amenable number.

28357057 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357057 is an equidigital number, since it uses as much as digits as its factorization.

28357057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 28357057 is about 5325.1344583963. The cubic root of 28357057 is about 304.9442055066.

The spelling of 28357057 in words is "twenty-eight million, three hundred fifty-seven thousand, fifty-seven".