28274809 has 2 divisors, whose sum is σ = 28274810. Its totient is φ = 28274808.

The previous prime is 28274801. The next prime is 28274887. The reversal of 28274809 is 90847282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26749584 + 1525225 = 5172^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 28274809 - 2³ = 28274801 is a prime.

It is not a weakly prime, because it can be changed into another prime (28274801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137404 + 14137405.

It is an arithmetic number, because the mean of its divisors is an integer number (14137405).

Almost surely, 2^28274809 is an apocalyptic number.

It is an amenable number.

28274809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28274809 is an equidigital number, since it uses as much as digits as its factorization.

28274809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28274809 is about 5317.4062286043. The cubic root of 28274809 is about 304.6490956759.

The spelling of 28274809 in words is "twenty-eight million, two hundred seventy-four thousand, eight hundred nine".