28908115 has 4 divisors (see below), whose sum is σ = 34689744. Its totient is φ = 23126488.

The previous prime is 28908091. The next prime is 28908193. The reversal of 28908115 is 51180982.

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 28908115 - 2⁹ = 28907603 is a prime.

It is a super-2 number, since 2×28908115² = 1671358225706450, which contains 22 as substring.

It is a Duffinian 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, 2890807 + ... + 2890816.

It is an arithmetic number, because the mean of its divisors is an integer number (8672436).

Almost surely, 2^28908115 is an apocalyptic number.

28908115 is a deficient number, since it is larger than the sum of its proper divisors (5781629).

28908115 is an equidigital number, since it uses as much as digits as its factorization.

28908115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5781628.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 28908115 is about 5376.6267305812. The cubic root of 28908115 is about 306.9068566970.

The spelling of 28908115 in words is "twenty-eight million, nine hundred eight thousand, one hundred fifteen".