28030055 has 4 divisors (see below), whose sum is σ = 33636072. Its totient is φ = 22424040.

The previous prime is 28030033. The next prime is 28030061. The reversal of 28030055 is 55003082.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-28030055 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28030055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2803001 + ... + 2803010.

It is an arithmetic number, because the mean of its divisors is an integer number (8409018).

Almost surely, 2^28030055 is an apocalyptic number.

28030055 is a deficient number, since it is larger than the sum of its proper divisors (5606017).

28030055 is an equidigital number, since it uses as much as digits as its factorization.

28030055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606016.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 28030055 is about 5294.3417910067. The cubic root of 28030055 is about 303.7675067670.

The spelling of 28030055 in words is "twenty-eight million, thirty thousand, fifty-five".