28905927 has 4 divisors (see below), whose sum is σ = 38541240. Its totient is φ = 19270616.

The previous prime is 28905911. The next prime is 28905949. The reversal of 28905927 is 72950982.

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 28905927 - 2⁴ = 28905911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28905907) 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, 4817652 + ... + 4817657.

It is an arithmetic number, because the mean of its divisors is an integer number (9635310).

Almost surely, 2^28905927 is an apocalyptic number.

28905927 is a deficient number, since it is larger than the sum of its proper divisors (9635313).

28905927 is an equidigital number, since it uses as much as digits as its factorization.

28905927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9635312.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 28905927 is about 5376.4232534279. The cubic root of 28905927 is about 306.8991134371.

The spelling of 28905927 in words is "twenty-eight million, nine hundred five thousand, nine hundred twenty-seven".