28513233 has 48 divisors (see below), whose sum is σ = 50618880. Its totient is φ = 15095808.

The previous prime is 28513229. The next prime is 28513259. The reversal of 28513233 is 33231582.

It is not a de Polignac number, because 28513233 - 2² = 28513229 is a prime.

It is a super-2 number, since 2×28513233² = 1626008912224578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28513197 and 28513206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28513213) 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 47 ways as a sum of consecutive naturals, for example, 84441 + ... + 84777.

It is an arithmetic number, because the mean of its divisors is an integer number (1054560).

Almost surely, 2^28513233 is an apocalyptic number.

It is an amenable number.

28513233 is a deficient number, since it is larger than the sum of its proper divisors (22105647).

28513233 is a wasteful number, since it uses less digits than its factorization.

28513233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 443 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 28513233 is about 5339.7783661871. The cubic root of 28513233 is about 305.5030058733.

It can be divided in two parts, 2851 and 3233, that added together give a square (6084 = 78²).

The spelling of 28513233 in words is "twenty-eight million, five hundred thirteen thousand, two hundred thirty-three".