28735009 has 2 divisors, whose sum is σ = 28735010. Its totient is φ = 28735008.

The previous prime is 28734991. The next prime is 28735013. The reversal of 28735009 is 90053782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25979409 + 2755600 = 5097^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 28735009 - 2¹⁵ = 28702241 is a prime.

It is not a weakly prime, because it can be changed into another prime (28735019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14367504 + 14367505.

It is an arithmetic number, because the mean of its divisors is an integer number (14367505).

Almost surely, 2^28735009 is an apocalyptic number.

It is an amenable number.

28735009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28735009 is an equidigital number, since it uses as much as digits as its factorization.

28735009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 28735009 is about 5360.5045471485. The cubic root of 28735009 is about 306.2930288562.

The spelling of 28735009 in words is "twenty-eight million, seven hundred thirty-five thousand, nine".