28468409 has 2 divisors, whose sum is σ = 28468410. Its totient is φ = 28468408.

The previous prime is 28468399. The next prime is 28468423. The reversal of 28468409 is 90486482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 7856809 = 4540^2 + 2803^2 .

It is a cyclic number.

It is not a de Polignac number, because 28468409 - 2¹² = 28464313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28468469) 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, 14234204 + 14234205.

It is an arithmetic number, because the mean of its divisors is an integer number (14234205).

Almost surely, 2^28468409 is an apocalyptic number.

It is an amenable number.

28468409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28468409 is an equidigital number, since it uses as much as digits as its factorization.

28468409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28468409 is about 5335.5795374073. The cubic root of 28468409 is about 305.3428340590.

The spelling of 28468409 in words is "twenty-eight million, four hundred sixty-eight thousand, four hundred nine".