28233147 has 4 divisors (see below), whose sum is σ = 37644200. Its totient is φ = 18822096.

The previous prime is 28233143. The next prime is 28233169. The reversal of 28233147 is 74133282.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28233147 - 2² = 28233143 is a prime.

It is a super-2 number, since 2×28233147² = 1594221179047218, which contains 22 as substring.

It is a Duffinian 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, 4705522 + ... + 4705527.

It is an arithmetic number, because the mean of its divisors is an integer number (9411050).

Almost surely, 2^28233147 is an apocalyptic number.

28233147 is a deficient number, since it is larger than the sum of its proper divisors (9411053).

28233147 is an equidigital number, since it uses as much as digits as its factorization.

28233147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411052.

The product of its digits is 8064, while the sum is 30.

The square root of 28233147 is about 5313.4872729687. The cubic root of 28233147 is about 304.4993919871.

The spelling of 28233147 in words is "twenty-eight million, two hundred thirty-three thousand, one hundred forty-seven".