28892009 has 2 divisors, whose sum is σ = 28892010. Its totient is φ = 28892008.

The previous prime is 28891999. The next prime is 28892011. The reversal of 28892009 is 90029882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 162409 = 5360^2 + 403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28892009 is a prime.

Together with 28892011, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1793396 and since 28892009 and 1793396 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28892069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14446004 + 14446005.

It is an arithmetic number, because the mean of its divisors is an integer number (14446005).

Almost surely, 2^28892009 is an apocalyptic number.

It is an amenable number.

28892009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28892009 is an equidigital number, since it uses as much as digits as its factorization.

28892009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 28892009 is about 5375.1287426442. The cubic root of 28892009 is about 306.8498489431.

The spelling of 28892009 in words is "twenty-eight million, eight hundred ninety-two thousand, nine".