28004789 has 8 divisors (see below), whose sum is σ = 28632960. Its totient is φ = 27383616.

The previous prime is 28004761. The next prime is 28004813. The reversal of 28004789 is 98740082.

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 28004789 - 2⁸ = 28004533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004719) 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, 6797 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (3579120).

Almost surely, 2^28004789 is an apocalyptic number.

It is an amenable number.

28004789 is a deficient number, since it is larger than the sum of its proper divisors (628171).

28004789 is a wasteful number, since it uses less digits than its factorization.

28004789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28004789 is about 5291.9551207470. The cubic root of 28004789 is about 303.6762083728.

The spelling of 28004789 in words is "twenty-eight million, four thousand, seven hundred eighty-nine".