28216033 has 4 divisors (see below), whose sum is σ = 28602628. Its totient is φ = 27829440.

The previous prime is 28216031. The next prime is 28216037. The reversal of 28216033 is 33061282.

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 11175649 + 17040384 = 3343^2 + 4128^2 .

It is a cyclic number.

It is not a de Polignac number, because 28216033 - 2¹ = 28216031 is a prime.

It is a super-3 number, since 3×28216033³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28215989 and 28216007.

It is not an unprimeable number, because it can be changed into a prime (28216031) 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, 193188 + ... + 193333.

It is an arithmetic number, because the mean of its divisors is an integer number (7150657).

Almost surely, 2^28216033 is an apocalyptic number.

It is an amenable number.

28216033 is a deficient number, since it is larger than the sum of its proper divisors (386595).

28216033 is an equidigital number, since it uses as much as digits as its factorization.

28216033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386594.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 28216033 is about 5311.8765987173. The cubic root of 28216033 is about 304.4378537308.

The spelling of 28216033 in words is "twenty-eight million, two hundred sixteen thousand, thirty-three".