28578289 has 8 divisors (see below), whose sum is σ = 29201472. Its totient is φ = 27958320.

The previous prime is 28578283. The next prime is 28578293. The reversal of 28578289 is 98287582.

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

It is a cyclic number.

It is not a de Polignac number, because 28578289 - 2⁵ = 28578257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28578283) 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, 27204 + ... + 28234.

It is an arithmetic number, because the mean of its divisors is an integer number (3650184).

Almost surely, 2^28578289 is an apocalyptic number.

It is an amenable number.

28578289 is a deficient number, since it is larger than the sum of its proper divisors (623183).

28578289 is a wasteful number, since it uses less digits than its factorization.

28578289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607.

The product of its digits is 645120, while the sum is 49.

The square root of 28578289 is about 5345.8665340616. The cubic root of 28578289 is about 305.7351753503.

The spelling of 28578289 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred eighty-nine".