28204889 has 2 divisors, whose sum is σ = 28204890. Its totient is φ = 28204888.

The previous prime is 28204871. The next prime is 28204903. The reversal of 28204889 is 98840282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 537289 = 5260^2 + 733^2 .

It is a cyclic number.

It is not a de Polignac number, because 28204889 - 2²⁰ = 27156313 is a prime.

It is not a weakly prime, because it can be changed into another prime (28204829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14102444 + 14102445.

It is an arithmetic number, because the mean of its divisors is an integer number (14102445).

Almost surely, 2^28204889 is an apocalyptic number.

It is an amenable number.

28204889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28204889 is an equidigital number, since it uses as much as digits as its factorization.

28204889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 28204889 is about 5310.8275249720. The cubic root of 28204889 is about 304.3977689300.

The spelling of 28204889 in words is "twenty-eight million, two hundred four thousand, eight hundred eighty-nine".