28364233 has 4 divisors (see below), whose sum is σ = 29342340. Its totient is φ = 27386128.

The previous prime is 28364227. The next prime is 28364261. The reversal of 28364233 is 33246382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8543929 + 19820304 = 2923^2 + 4452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28364233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28364195 and 28364204.

It is not an unprimeable number, because it can be changed into a prime (28364213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489010 + ... + 489067.

It is an arithmetic number, because the mean of its divisors is an integer number (7335585).

Almost surely, 2^28364233 is an apocalyptic number.

It is an amenable number.

28364233 is a deficient number, since it is larger than the sum of its proper divisors (978107).

28364233 is an equidigital number, since it uses as much as digits as its factorization.

28364233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978106.

The product of its digits is 20736, while the sum is 31.

The square root of 28364233 is about 5325.8082015784. The cubic root of 28364233 is about 304.9699262652.

It can be divided in two parts, 283 and 64233, that added together give a square (64516 = 254²).

The spelling of 28364233 in words is "twenty-eight million, three hundred sixty-four thousand, two hundred thirty-three".