28357657 has 2 divisors, whose sum is σ = 28357658. Its totient is φ = 28357656.

The previous prime is 28357639. The next prime is 28357661. The reversal of 28357657 is 75675382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 2996361 = 5036^2 + 1731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28357657 is a prime.

It is not a weakly prime, because it can be changed into another prime (28357607) 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, 14178828 + 14178829.

It is an arithmetic number, because the mean of its divisors is an integer number (14178829).

Almost surely, 2^28357657 is an apocalyptic number.

It is an amenable number.

28357657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357657 is an equidigital number, since it uses as much as digits as its factorization.

28357657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 43.

The square root of 28357657 is about 5325.1907947040. The cubic root of 28357657 is about 304.9463562379.

The spelling of 28357657 in words is "twenty-eight million, three hundred fifty-seven thousand, six hundred fifty-seven".