28704523 has 2 divisors, whose sum is σ = 28704524. Its totient is φ = 28704522.

The previous prime is 28704509. The next prime is 28704527. The reversal of 28704523 is 32540782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28704523 - 2⁵ = 28704491 is a prime.

It is not a weakly prime, because it can be changed into another prime (28704527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352261 + 14352262.

It is an arithmetic number, because the mean of its divisors is an integer number (14352262).

Almost surely, 2^28704523 is an apocalyptic number.

28704523 is a deficient number, since it is larger than the sum of its proper divisors (1).

28704523 is an equidigital number, since it uses as much as digits as its factorization.

28704523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28704523 is about 5357.6602169231. The cubic root of 28704523 is about 306.1846714463.

The spelling of 28704523 in words is "twenty-eight million, seven hundred four thousand, five hundred twenty-three".