28455233 has 4 divisors (see below), whose sum is σ = 28465920. Its totient is φ = 28444548.

The previous prime is 28455221. The next prime is 28455277. The reversal of 28455233 is 33255482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28455233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28455233.

It is not an unprimeable number, because it can be changed into a prime (28455533) 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, 2216 + ... + 7862.

It is an arithmetic number, because the mean of its divisors is an integer number (7116480).

Almost surely, 2^28455233 is an apocalyptic number.

It is an amenable number.

28455233 is a deficient number, since it is larger than the sum of its proper divisors (10687).

28455233 is an equidigital number, since it uses as much as digits as its factorization.

28455233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10686.

The product of its digits is 28800, while the sum is 32.

The square root of 28455233 is about 5334.3446645300. The cubic root of 28455233 is about 305.2957196356.

The spelling of 28455233 in words is "twenty-eight million, four hundred fifty-five thousand, two hundred thirty-three".