28784323 has 4 divisors (see below), whose sum is σ = 29189808. Its totient is φ = 28378840.

The previous prime is 28784309. The next prime is 28784359. The reversal of 28784323 is 32348782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28784323 - 2¹³ = 28776131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28784363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202636 + ... + 202777.

It is an arithmetic number, because the mean of its divisors is an integer number (7297452).

Almost surely, 2^28784323 is an apocalyptic number.

28784323 is a deficient number, since it is larger than the sum of its proper divisors (405485).

28784323 is an equidigital number, since it uses as much as digits as its factorization.

28784323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405484.

The product of its digits is 64512, while the sum is 37.

The square root of 28784323 is about 5365.1023289402. The cubic root of 28784323 is about 306.4681451175.

The spelling of 28784323 in words is "twenty-eight million, seven hundred eighty-four thousand, three hundred twenty-three".