28088889 has 8 divisors (see below), whose sum is σ = 37738272. Its totient is φ = 18582720.

The previous prime is 28088861. The next prime is 28088903. The reversal of 28088889 is 98888082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28088889 - 2¹³ = 28080697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28088839) 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 7 ways as a sum of consecutive naturals, for example, 35344 + ... + 36129.

It is an arithmetic number, because the mean of its divisors is an integer number (4717284).

Almost surely, 2^28088889 is an apocalyptic number.

It is an amenable number.

28088889 is a deficient number, since it is larger than the sum of its proper divisors (9649383).

28088889 is a wasteful number, since it uses less digits than its factorization.

28088889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71607.

The product of its (nonzero) digits is 589824, while the sum is 51.

The square root of 28088889 is about 5299.8951876429. The cubic root of 28088889 is about 303.9798903191.

The spelling of 28088889 in words is "twenty-eight million, eighty-eight thousand, eight hundred eighty-nine".