28509959 has 2 divisors, whose sum is σ = 28509960. Its totient is φ = 28509958.

The previous prime is 28509953. The next prime is 28509961. The reversal of 28509959 is 95990582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28509959 - 2²⁰ = 27461383 is a prime.

Together with 28509961, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28509953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254979 + 14254980.

It is an arithmetic number, because the mean of its divisors is an integer number (14254980).

Almost surely, 2^28509959 is an apocalyptic number.

28509959 is a deficient number, since it is larger than the sum of its proper divisors (1).

28509959 is an equidigital number, since it uses as much as digits as its factorization.

28509959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 28509959 is about 5339.4717903553. The cubic root of 28509959 is about 305.4913124124.

The spelling of 28509959 in words is "twenty-eight million, five hundred nine thousand, nine hundred fifty-nine".