28784733 has 8 divisors (see below), whose sum is σ = 39703200. Its totient is φ = 18528048.

The previous prime is 28784731. The next prime is 28784737. The reversal of 28784733 is 33748782.

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

It is not a de Polignac number, because 28784733 - 2¹ = 28784731 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784731) 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, 165343 + ... + 165516.

It is an arithmetic number, because the mean of its divisors is an integer number (4962900).

Almost surely, 2^28784733 is an apocalyptic number.

It is an amenable number.

28784733 is a deficient number, since it is larger than the sum of its proper divisors (10918467).

28784733 is a wasteful number, since it uses less digits than its factorization.

28784733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330891.

The product of its digits is 225792, while the sum is 42.

The square root of 28784733 is about 5365.1405386998. The cubic root of 28784733 is about 306.4696002075.

The spelling of 28784733 in words is "twenty-eight million, seven hundred eighty-four thousand, seven hundred thirty-three".