28903409 has 2 divisors, whose sum is σ = 28903410. Its totient is φ = 28903408.

The previous prime is 28903393. The next prime is 28903411. The reversal of 28903409 is 90430982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28143025 + 760384 = 5305^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 28903409 - 2⁴ = 28903393 is a prime.

Together with 28903411, 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 (28903429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14451704 + 14451705.

It is an arithmetic number, because the mean of its divisors is an integer number (14451705).

Almost surely, 2^28903409 is an apocalyptic number.

It is an amenable number.

28903409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28903409 is an equidigital number, since it uses as much as digits as its factorization.

28903409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28903409 is about 5376.1890777762. The cubic root of 28903409 is about 306.8902018344.

The spelling of 28903409 in words is "twenty-eight million, nine hundred three thousand, four hundred nine".