28568091 has 4 divisors (see below), whose sum is σ = 38090792. Its totient is φ = 19045392.

The previous prime is 28568083. The next prime is 28568101. The reversal of 28568091 is 19086582.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28568091 - 2³ = 28568083 is a prime.

It is a super-2 number, since 2×28568091² = 1632271646768562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28568051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4761346 + ... + 4761351.

It is an arithmetic number, because the mean of its divisors is an integer number (9522698).

Almost surely, 2^28568091 is an apocalyptic number.

28568091 is a deficient number, since it is larger than the sum of its proper divisors (9522701).

28568091 is an equidigital number, since it uses as much as digits as its factorization.

28568091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9522700.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28568091 is about 5344.9126279108. The cubic root of 28568091 is about 305.6988044039.

The spelling of 28568091 in words is "twenty-eight million, five hundred sixty-eight thousand, ninety-one".