28680251 has 2 divisors, whose sum is σ = 28680252. Its totient is φ = 28680250.

The previous prime is 28680209. The next prime is 28680257. The reversal of 28680251 is 15208682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28680251 - 2¹⁸ = 28418107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28680257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14340125 + 14340126.

It is an arithmetic number, because the mean of its divisors is an integer number (14340126).

Almost surely, 2^28680251 is an apocalyptic number.

28680251 is a deficient number, since it is larger than the sum of its proper divisors (1).

28680251 is an equidigital number, since it uses as much as digits as its factorization.

28680251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28680251 is about 5355.3945699640. The cubic root of 28680251 is about 306.0983457938.

The spelling of 28680251 in words is "twenty-eight million, six hundred eighty thousand, two hundred fifty-one".