28233149 has 4 divisors (see below), whose sum is σ = 32266464. Its totient is φ = 24199836.

The previous prime is 28233143. The next prime is 28233169. The reversal of 28233149 is 94133282.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-28233149 is a prime.

It is a super-2 number, since 2×28233149² = 1594221404912402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28233143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2016647 + ... + 2016660.

It is an arithmetic number, because the mean of its divisors is an integer number (8066616).

Almost surely, 2^28233149 is an apocalyptic number.

It is an amenable number.

28233149 is a deficient number, since it is larger than the sum of its proper divisors (4033315).

28233149 is an equidigital number, since it uses as much as digits as its factorization.

28233149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033314.

The product of its digits is 10368, while the sum is 32.

The square root of 28233149 is about 5313.4874611690. The cubic root of 28233149 is about 304.4993991772.

It can be divided in two parts, 28233 and 149, that added together give a palindrome (28382).

The spelling of 28233149 in words is "twenty-eight million, two hundred thirty-three thousand, one hundred forty-nine".