28998233 has 4 divisors (see below), whose sum is σ = 31634448. Its totient is φ = 26362020.

The previous prime is 28998227. The next prime is 28998257. The reversal of 28998233 is 33289982.

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.

It is a cyclic number.

It is not a de Polignac number, because 28998233 - 2⁴ = 28998217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28998133) 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, 1318091 + ... + 1318112.

It is an arithmetic number, because the mean of its divisors is an integer number (7908612).

Almost surely, 2^28998233 is an apocalyptic number.

It is an amenable number.

28998233 is a deficient number, since it is larger than the sum of its proper divisors (2636215).

28998233 is a wasteful number, since it uses less digits than its factorization.

28998233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636214.

The product of its digits is 186624, while the sum is 44.

The square root of 28998233 is about 5385.0007428040. Note that the first 3 decimals coincide. The cubic root of 28998233 is about 307.2254424604.

The spelling of 28998233 in words is "twenty-eight million, nine hundred ninety-eight thousand, two hundred thirty-three".