28233129 has 4 divisors (see below), whose sum is σ = 37644176. Its totient is φ = 18822084.

The previous prime is 28233119. The next prime is 28233131. The reversal of 28233129 is 92133282.

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 not a de Polignac number, because 28233129 - 2⁴ = 28233113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28233096 and 28233105.

It is not an unprimeable number, because it can be changed into a prime (28233119) 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, 4705519 + ... + 4705524.

It is an arithmetic number, because the mean of its divisors is an integer number (9411044).

Almost surely, 2^28233129 is an apocalyptic number.

It is an amenable number.

28233129 is a deficient number, since it is larger than the sum of its proper divisors (9411047).

28233129 is an equidigital number, since it uses as much as digits as its factorization.

28233129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411046.

The product of its digits is 5184, while the sum is 30.

The square root of 28233129 is about 5313.4855791655. The cubic root of 28233129 is about 304.4993272760.

It can be divided in two parts, 282 and 33129, that added together give a triangular number (33411 = T₂₅₈).

The spelling of 28233129 in words is "twenty-eight million, two hundred thirty-three thousand, one hundred twenty-nine".