28066019 has 4 divisors (see below), whose sum is σ = 28097160. Its totient is φ = 28034880.

The previous prime is 28066007. The next prime is 28066033. The reversal of 28066019 is 91066082.

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

It is a cyclic number.

It is not a de Polignac number, because 28066019 - 2¹² = 28061923 is a prime.

It is a super-2 number, since 2×28066019² = 1575402845016722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28066069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14177 + ... + 16034.

It is an arithmetic number, because the mean of its divisors is an integer number (7024290).

Almost surely, 2^28066019 is an apocalyptic number.

28066019 is a deficient number, since it is larger than the sum of its proper divisors (31141).

28066019 is an equidigital number, since it uses as much as digits as its factorization.

28066019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31140.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 28066019 is about 5297.7371584479. The cubic root of 28066019 is about 303.8973676803.

The spelling of 28066019 in words is "twenty-eight million, sixty-six thousand, nineteen".