28609089 has 4 divisors (see below), whose sum is σ = 38145456. Its totient is φ = 19072724.

The previous prime is 28609073. The next prime is 28609093. The reversal of 28609089 is 98090682.

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 a cyclic number.

It is not a de Polignac number, because 28609089 - 2⁴ = 28609073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28609089.

It is not an unprimeable number, because it can be changed into a prime (28609019) 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, 4768179 + ... + 4768184.

It is an arithmetic number, because the mean of its divisors is an integer number (9536364).

Almost surely, 2^28609089 is an apocalyptic number.

It is an amenable number.

28609089 is a deficient number, since it is larger than the sum of its proper divisors (9536367).

28609089 is an equidigital number, since it uses as much as digits as its factorization.

28609089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9536366.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 28609089 is about 5348.7464886644. The cubic root of 28609089 is about 305.8449703830.

The spelling of 28609089 in words is "twenty-eight million, six hundred nine thousand, eighty-nine".