28838809 has 2 divisors, whose sum is σ = 28838810. Its totient is φ = 28838808.

The previous prime is 28838807. The next prime is 28838819. The reversal of 28838809 is 90883882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24950025 + 3888784 = 4995^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 28838809 - 2¹ = 28838807 is a prime.

Together with 28838807, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28838807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14419404 + 14419405.

It is an arithmetic number, because the mean of its divisors is an integer number (14419405).

Almost surely, 2^28838809 is an apocalyptic number.

It is an amenable number.

28838809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28838809 is an equidigital number, since it uses as much as digits as its factorization.

28838809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 28838809 is about 5370.1777437995. The cubic root of 28838809 is about 306.6613949682.

The spelling of 28838809 in words is "twenty-eight million, eight hundred thirty-eight thousand, eight hundred nine".