28394257 has 2 divisors, whose sum is σ = 28394258. Its totient is φ = 28394256.

The previous prime is 28394203. The next prime is 28394287. The reversal of 28394257 is 75249382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23030401 + 5363856 = 4799^2 + 2316^2 .

It is a cyclic number.

It is not a de Polignac number, because 28394257 - 2⁷ = 28394129 is a prime.

It is not a weakly prime, because it can be changed into another prime (28394287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14197128 + 14197129.

It is an arithmetic number, because the mean of its divisors is an integer number (14197129).

Almost surely, 2^28394257 is an apocalyptic number.

It is an amenable number.

28394257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28394257 is an equidigital number, since it uses as much as digits as its factorization.

28394257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 28394257 is about 5328.6261831733. The cubic root of 28394257 is about 305.0774935223.

The spelling of 28394257 in words is "twenty-eight million, three hundred ninety-four thousand, two hundred fifty-seven".