28091214 has 24 divisors (see below), whose sum is σ = 62510760. Its totient is φ = 9110448.

The previous prime is 28091213. The next prime is 28091249. The reversal of 28091214 is 41219082.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28091213) 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 11 ways as a sum of consecutive naturals, for example, 20424 + ... + 21755.

It is an arithmetic number, because the mean of its divisors is an integer number (2604615).

Almost surely, 2^28091214 is an apocalyptic number.

28091214 is an abundant number, since it is smaller than the sum of its proper divisors (34419546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28091214 is a wasteful number, since it uses less digits than its factorization.

28091214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42224 (or 42221 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28091214 is about 5300.1145270645. The cubic root of 28091214 is about 303.9882771911.

The spelling of 28091214 in words is "twenty-eight million, ninety-one thousand, two hundred fourteen".