28755233 has 4 divisors (see below), whose sum is σ = 30967188. Its totient is φ = 26543280.

The previous prime is 28755193. The next prime is 28755239. The reversal of 28755233 is 33255782.

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 9684544 + 19070689 = 3112^2 + 4367^2 .

It is a cyclic number.

It is not a de Polignac number, because 28755233 - 2⁸ = 28754977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28755193 and 28755202.

It is not an unprimeable number, because it can be changed into a prime (28755239) 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, 1105958 + ... + 1105983.

It is an arithmetic number, because the mean of its divisors is an integer number (7741797).

Almost surely, 2^28755233 is an apocalyptic number.

It is an amenable number.

28755233 is a deficient number, since it is larger than the sum of its proper divisors (2211955).

28755233 is a wasteful number, since it uses less digits than its factorization.

28755233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211954.

The product of its digits is 50400, while the sum is 35.

The square root of 28755233 is about 5362.3906049448. The cubic root of 28755233 is about 306.3648694176.

The spelling of 28755233 in words is "twenty-eight million, seven hundred fifty-five thousand, two hundred thirty-three".