28104689 has 8 divisors (see below), whose sum is σ = 31052160. Its totient is φ = 25301056.

The previous prime is 28104679. The next prime is 28104701. The reversal of 28104689 is 98640182.

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 28104689 - 2¹⁶ = 28039153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28104619) 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, 35549 + ... + 36330.

It is an arithmetic number, because the mean of its divisors is an integer number (3881520).

Almost surely, 2^28104689 is an apocalyptic number.

It is an amenable number.

28104689 is a deficient number, since it is larger than the sum of its proper divisors (2947471).

28104689 is a wasteful number, since it uses less digits than its factorization.

28104689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71919.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28104689 is about 5301.3855736024. The cubic root of 28104689 is about 304.0368758649.

The spelling of 28104689 in words is "twenty-eight million, one hundred four thousand, six hundred eighty-nine".