28953409 has 2 divisors, whose sum is σ = 28953410. Its totient is φ = 28953408.

The previous prime is 28953383. The next prime is 28953427. The reversal of 28953409 is 90435982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21418384 + 7535025 = 4628^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 28953409 - 2⁹ = 28952897 is a prime.

It is not a weakly prime, because it can be changed into another prime (28953809) 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, 14476704 + 14476705.

It is an arithmetic number, because the mean of its divisors is an integer number (14476705).

Almost surely, 2^28953409 is an apocalyptic number.

It is an amenable number.

28953409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28953409 is an equidigital number, since it uses as much as digits as its factorization.

28953409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 28953409 is about 5380.8372025178. The cubic root of 28953409 is about 307.0670629841.

The spelling of 28953409 in words is "twenty-eight million, nine hundred fifty-three thousand, four hundred nine".