28905233 has 4 divisors (see below), whose sum is σ = 33034560. Its totient is φ = 24775908.

The previous prime is 28905229. The next prime is 28905241. The reversal of 28905233 is 33250982.

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 an emirpimes, since its reverse is a distinct semiprime: 33250982 = 2 ⋅16625491.

It is a cyclic number.

It is not a de Polignac number, because 28905233 - 2² = 28905229 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 28905233.

It is not an unprimeable number, because it can be changed into a prime (28905203) 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, 2064653 + ... + 2064666.

It is an arithmetic number, because the mean of its divisors is an integer number (8258640).

Almost surely, 2^28905233 is an apocalyptic number.

It is an amenable number.

28905233 is a deficient number, since it is larger than the sum of its proper divisors (4129327).

28905233 is an equidigital number, since it uses as much as digits as its factorization.

28905233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129326.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 28905233 is about 5376.3587119909. The cubic root of 28905233 is about 306.8966573123.

The spelling of 28905233 in words is "twenty-eight million, nine hundred five thousand, two hundred thirty-three".