28914089 has 4 divisors (see below), whose sum is σ = 28936020. Its totient is φ = 28892160.

The previous prime is 28914043. The next prime is 28914113. The reversal of 28914089 is 98041982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7198489 + 21715600 = 2683^2 + 4660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28914089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28914689) 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, 8852 + ... + 11669.

It is an arithmetic number, because the mean of its divisors is an integer number (7234005).

Almost surely, 2^28914089 is an apocalyptic number.

It is an amenable number.

28914089 is a deficient number, since it is larger than the sum of its proper divisors (21931).

28914089 is a wasteful number, since it uses less digits than its factorization.

28914089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21930.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 28914089 is about 5377.1822546758. The cubic root of 28914089 is about 306.9279964967.

The spelling of 28914089 in words is "twenty-eight million, nine hundred fourteen thousand, eighty-nine".