28575257 has 2 divisors, whose sum is σ = 28575258. Its totient is φ = 28575256.

The previous prime is 28575251. The next prime is 28575277. The reversal of 28575257 is 75257582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 1990921 = 5156^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 28575257 - 2¹² = 28571161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28575251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14287628 + 14287629.

It is an arithmetic number, because the mean of its divisors is an integer number (14287629).

Almost surely, 2^28575257 is an apocalyptic number.

It is an amenable number.

28575257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28575257 is an equidigital number, since it uses as much as digits as its factorization.

28575257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196000, while the sum is 41.

The square root of 28575257 is about 5345.5829429539. The cubic root of 28575257 is about 305.7243626918.

The spelling of 28575257 in words is "twenty-eight million, five hundred seventy-five thousand, two hundred fifty-seven".