28233213 has 8 divisors (see below), whose sum is σ = 39281088. Its totient is φ = 18003744.

The previous prime is 28233199. The next prime is 28233217. The reversal of 28233213 is 31233282.

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

It is not a de Polignac number, because 28233213 - 2¹⁶ = 28167677 is a prime.

It is a super-2 number, since 2×28233213² = 1594228632606738, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28233217) 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, 204520 + ... + 204657.

It is an arithmetic number, because the mean of its divisors is an integer number (4910136).

Almost surely, 2^28233213 is an apocalyptic number.

28233213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28233213 is a deficient number, since it is larger than the sum of its proper divisors (11047875).

28233213 is a wasteful number, since it uses less digits than its factorization.

28233213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409203.

The product of its digits is 1728, while the sum is 24.

The square root of 28233213 is about 5313.4934835756. The cubic root of 28233213 is about 304.4996292607.

Adding to 28233213 its reverse (31233282), we get a palindrome (59466495).

The spelling of 28233213 in words is "twenty-eight million, two hundred thirty-three thousand, two hundred thirteen".