28181627 has 4 divisors (see below), whose sum is σ = 28211280. Its totient is φ = 28151976.

The previous prime is 28181609. The next prime is 28181633. The reversal of 28181627 is 72618182.

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 28181627 - 2¹⁶ = 28116091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28181677) 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 in 3 ways as a sum of consecutive naturals, for example, 13352 + ... + 15317.

It is an arithmetic number, because the mean of its divisors is an integer number (7052820).

Almost surely, 2^28181627 is an apocalyptic number.

28181627 is a deficient number, since it is larger than the sum of its proper divisors (29653).

28181627 is an equidigital number, since it uses as much as digits as its factorization.

28181627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29652.

The product of its digits is 10752, while the sum is 35.

The square root of 28181627 is about 5308.6370190474. The cubic root of 28181627 is about 304.3140618293.

The spelling of 28181627 in words is "twenty-eight million, one hundred eighty-one thousand, six hundred twenty-seven".