28473409 has 2 divisors, whose sum is σ = 28473410. Its totient is φ = 28473408.

The previous prime is 28473391. The next prime is 28473433. The reversal of 28473409 is 90437482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 2259009 = 5120^2 + 1503^2 .

It is a cyclic number.

It is not a de Polignac number, because 28473409 - 2⁷ = 28473281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28473499) 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, 14236704 + 14236705.

It is an arithmetic number, because the mean of its divisors is an integer number (14236705).

Almost surely, 2^28473409 is an apocalyptic number.

It is an amenable number.

28473409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28473409 is an equidigital number, since it uses as much as digits as its factorization.

28473409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28473409 is about 5336.0480694986. The cubic root of 28473409 is about 305.3607091335.

It can be divided in two parts, 28473 and 409, that added together give a palindrome (28882).

The spelling of 28473409 in words is "twenty-eight million, four hundred seventy-three thousand, four hundred nine".