28004533 has 2 divisors, whose sum is σ = 28004534. Its totient is φ = 28004532.

The previous prime is 28004521. The next prime is 28004539. The reversal of 28004533 is 33540082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17363889 + 10640644 = 4167^2 + 3262^2 .

It is a cyclic number.

It is not a de Polignac number, because 28004533 - 2⁹ = 28004021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28004498 and 28004507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28004539) 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, 14002266 + 14002267.

It is an arithmetic number, because the mean of its divisors is an integer number (14002267).

Almost surely, 2^28004533 is an apocalyptic number.

It is an amenable number.

28004533 is a deficient number, since it is larger than the sum of its proper divisors (1).

28004533 is an equidigital number, since it uses as much as digits as its factorization.

28004533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 28004533 is about 5291.9309330338. The cubic root of 28004533 is about 303.6752830388.

The spelling of 28004533 in words is "twenty-eight million, four thousand, five hundred thirty-three".