28333289 has 2 divisors, whose sum is σ = 28333290. Its totient is φ = 28333288.

The previous prime is 28333273. The next prime is 28333301. The reversal of 28333289 is 98233382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25836889 + 2496400 = 5083^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 28333289 - 2⁴ = 28333273 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28333229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14166644 + 14166645.

It is an arithmetic number, because the mean of its divisors is an integer number (14166645).

Almost surely, 2^28333289 is an apocalyptic number.

It is an amenable number.

28333289 is a deficient number, since it is larger than the sum of its proper divisors (1).

28333289 is an equidigital number, since it uses as much as digits as its factorization.

28333289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 28333289 is about 5322.9023098306. The cubic root of 28333289 is about 304.8589834540.

The spelling of 28333289 in words is "twenty-eight million, three hundred thirty-three thousand, two hundred eighty-nine".