28840089 has 4 divisors (see below), whose sum is σ = 38453456. Its totient is φ = 19226724.

The previous prime is 28840087. The next prime is 28840099. The reversal of 28840089 is 98004882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28840089 - 2¹ = 28840087 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28840087) 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, 4806679 + ... + 4806684.

It is an arithmetic number, because the mean of its divisors is an integer number (9613364).

Almost surely, 2^28840089 is an apocalyptic number.

It is an amenable number.

28840089 is a deficient number, since it is larger than the sum of its proper divisors (9613367).

28840089 is an equidigital number, since it uses as much as digits as its factorization.

28840089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9613366.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28840089 is about 5370.2969191656. The cubic root of 28840089 is about 306.6659319191.

The spelling of 28840089 in words is "twenty-eight million, eight hundred forty thousand, eighty-nine".