28091678 has 8 divisors (see below), whose sum is σ = 42290472. Its totient is φ = 13994856.

The previous prime is 28091677. The next prime is 28091711. The reversal of 28091678 is 87619082.

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 not an unprimeable number, because it can be changed into a prime (28091677) 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, 24800 + ... + 25907.

It is an arithmetic number, because the mean of its divisors is an integer number (5286309).

Almost surely, 2^28091678 is an apocalyptic number.

28091678 is a deficient number, since it is larger than the sum of its proper divisors (14198794).

28091678 is a wasteful number, since it uses less digits than its factorization.

28091678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50986.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28091678 is about 5300.1582995228. The cubic root of 28091678 is about 303.9899509028.

The spelling of 28091678 in words is "twenty-eight million, ninety-one thousand, six hundred seventy-eight".