28055289 has 8 divisors (see below), whose sum is σ = 37480672. Its totient is φ = 18666720.

The previous prime is 28055273. The next prime is 28055299. The reversal of 28055289 is 98255082.

28055289 is nontrivially palindromic in base 12.

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

It is not a de Polignac number, because 28055289 - 2⁴ = 28055273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28055299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7372 + ... + 10509.

It is an arithmetic number, because the mean of its divisors is an integer number (4685084).

Almost surely, 2^28055289 is an apocalyptic number.

It is an amenable number.

28055289 is a deficient number, since it is larger than the sum of its proper divisors (9425383).

28055289 is a wasteful number, since it uses less digits than its factorization.

28055289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18407.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 28055289 is about 5296.7243651147. The cubic root of 28055289 is about 303.8586347866.

The spelling of 28055289 in words is "twenty-eight million, fifty-five thousand, two hundred eighty-nine".