28784559 has 8 divisors (see below), whose sum is σ = 39702960. Its totient is φ = 18527936.

The previous prime is 28784549. The next prime is 28784579. The reversal of 28784559 is 95548782.

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 28784559 - 2⁴ = 28784543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784549) 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, 165342 + ... + 165515.

It is an arithmetic number, because the mean of its divisors is an integer number (4962870).

Almost surely, 2^28784559 is an apocalyptic number.

28784559 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28784559 is a deficient number, since it is larger than the sum of its proper divisors (10918401).

28784559 is a wasteful number, since it uses less digits than its factorization.

28784559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330889.

The product of its digits is 806400, while the sum is 48.

The square root of 28784559 is about 5365.1243228839. The cubic root of 28784559 is about 306.4689826832.

The spelling of 28784559 in words is "twenty-eight million, seven hundred eighty-four thousand, five hundred fifty-nine".