28904969 has 2 divisors, whose sum is σ = 28904970. Its totient is φ = 28904968.

The previous prime is 28904963. The next prime is 28904977. The reversal of 28904969 is 96940982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17749369 + 11155600 = 4213^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904969 - 2²⁰ = 27856393 is a prime.

It is a super-2 number, since 2×28904969² = 1670994465781922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28904963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452484 + 14452485.

It is an arithmetic number, because the mean of its divisors is an integer number (14452485).

Almost surely, 2^28904969 is an apocalyptic number.

It is an amenable number.

28904969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904969 is an equidigital number, since it uses as much as digits as its factorization.

28904969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 28904969 is about 5376.3341600016. The cubic root of 28904969 is about 306.8957229837.

The spelling of 28904969 in words is "twenty-eight million, nine hundred four thousand, nine hundred sixty-nine".