28891214 has 8 divisors (see below), whose sum is σ = 47276568. Its totient is φ = 13132360.

The previous prime is 28891207. The next prime is 28891231. The reversal of 28891214 is 41219882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 656597 + ... + 656640.

It is an arithmetic number, because the mean of its divisors is an integer number (5909571).

Almost surely, 2^28891214 is an apocalyptic number.

28891214 is a deficient number, since it is larger than the sum of its proper divisors (18385354).

28891214 is a wasteful number, since it uses less digits than its factorization.

28891214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313250.

The product of its digits is 9216, while the sum is 35.

The square root of 28891214 is about 5375.0547904184. The cubic root of 28891214 is about 306.8470344640.

The spelling of 28891214 in words is "twenty-eight million, eight hundred ninety-one thousand, two hundred fourteen".