28508947 has 2 divisors, whose sum is σ = 28508948. Its totient is φ = 28508946.

The previous prime is 28508903. The next prime is 28508959. The reversal of 28508947 is 74980582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28508947 - 2⁷ = 28508819 is a prime.

It is not a weakly prime, because it can be changed into another prime (28508147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254473 + 14254474.

It is an arithmetic number, because the mean of its divisors is an integer number (14254474).

Almost surely, 2^28508947 is an apocalyptic number.

28508947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508947 is an equidigital number, since it uses as much as digits as its factorization.

28508947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 28508947 is about 5339.3770235862. The cubic root of 28508947 is about 305.4876977589.

The spelling of 28508947 in words is "twenty-eight million, five hundred eight thousand, nine hundred forty-seven".