28005553 has 2 divisors, whose sum is σ = 28005554. Its totient is φ = 28005552.

The previous prime is 28005533. The next prime is 28005557. The reversal of 28005553 is 35550082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28005264 + 289 = 5292^2 + 17^2 .

It is a cyclic number.

It is not a de Polignac number, because 28005553 - 2⁵ = 28005521 is a prime.

It is not a weakly prime, because it can be changed into another prime (28005557) 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, 14002776 + 14002777.

It is an arithmetic number, because the mean of its divisors is an integer number (14002777).

Almost surely, 2^28005553 is an apocalyptic number.

It is an amenable number.

28005553 is a deficient number, since it is larger than the sum of its proper divisors (1).

28005553 is an equidigital number, since it uses as much as digits as its factorization.

28005553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 28005553 is about 5292.0273052961. The cubic root of 28005553 is about 303.6789698828.

The spelling of 28005553 in words is "twenty-eight million, five thousand, five hundred fifty-three".