28242257 has 2 divisors, whose sum is σ = 28242258. Its totient is φ = 28242256.

The previous prime is 28242241. The next prime is 28242283. The reversal of 28242257 is 75224282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26122321 + 2119936 = 5111^2 + 1456^2 .

It is a cyclic number.

It is not a de Polignac number, because 28242257 - 2⁴ = 28242241 is a prime.

It is not a weakly prime, because it can be changed into another prime (28244257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121128 + 14121129.

It is an arithmetic number, because the mean of its divisors is an integer number (14121129).

Almost surely, 2^28242257 is an apocalyptic number.

It is an amenable number.

28242257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28242257 is an equidigital number, since it uses as much as digits as its factorization.

28242257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 32.

The square root of 28242257 is about 5314.3444562806. The cubic root of 28242257 is about 304.5321394423.

The spelling of 28242257 in words is "twenty-eight million, two hundred forty-two thousand, two hundred fifty-seven".