28256507 has 2 divisors, whose sum is σ = 28256508. Its totient is φ = 28256506.

The previous prime is 28256497. The next prime is 28256549. The reversal of 28256507 is 70565282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28256507 - 2⁸ = 28256251 is a prime.

It is not a weakly prime, because it can be changed into another prime (28252507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128253 + 14128254.

It is an arithmetic number, because the mean of its divisors is an integer number (14128254).

Almost surely, 2^28256507 is an apocalyptic number.

28256507 is a deficient number, since it is larger than the sum of its proper divisors (1).

28256507 is an equidigital number, since it uses as much as digits as its factorization.

28256507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 28256507 is about 5315.6849981917. The cubic root of 28256507 is about 304.5833493878.

The spelling of 28256507 in words is "twenty-eight million, two hundred fifty-six thousand, five hundred seven".