28864009 has 2 divisors, whose sum is σ = 28864010. Its totient is φ = 28864008.

The previous prime is 28864001. The next prime is 28864027. The reversal of 28864009 is 90046882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28858384 + 5625 = 5372^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 28864009 - 2³ = 28864001 is a prime.

It is not a weakly prime, because it can be changed into another prime (28864001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14432004 + 14432005.

It is an arithmetic number, because the mean of its divisors is an integer number (14432005).

Almost surely, 2^28864009 is an apocalyptic number.

It is an amenable number.

28864009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28864009 is an equidigital number, since it uses as much as digits as its factorization.

28864009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28864009 is about 5372.5235225171. The cubic root of 28864009 is about 306.7506915051.

The spelling of 28864009 in words is "twenty-eight million, eight hundred sixty-four thousand, nine".