28190289 has 8 divisors (see below), whose sum is σ = 37745280. Its totient is φ = 18714416.

The previous prime is 28190273. The next prime is 28190293. The reversal of 28190289 is 98209182.

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 28190289 - 2⁴ = 28190273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28190209) 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, 18942 + ... + 20375.

It is an arithmetic number, because the mean of its divisors is an integer number (4718160).

Almost surely, 2^28190289 is an apocalyptic number.

It is an amenable number.

28190289 is a deficient number, since it is larger than the sum of its proper divisors (9554991).

28190289 is a wasteful number, since it uses less digits than its factorization.

28190289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39559.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 28190289 is about 5309.4527966637. The cubic root of 28190289 is about 304.3452369679.

The spelling of 28190289 in words is "twenty-eight million, one hundred ninety thousand, two hundred eighty-nine".