28044147 has 4 divisors (see below), whose sum is σ = 37392200. Its totient is φ = 18696096.

The previous prime is 28044139. The next prime is 28044151. The reversal of 28044147 is 74144082.

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

It is not a de Polignac number, because 28044147 - 2³ = 28044139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28044157) 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, 4674022 + ... + 4674027.

It is an arithmetic number, because the mean of its divisors is an integer number (9348050).

Almost surely, 2^28044147 is an apocalyptic number.

28044147 is a deficient number, since it is larger than the sum of its proper divisors (9348053).

28044147 is an equidigital number, since it uses as much as digits as its factorization.

28044147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348052.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 28044147 is about 5295.6724785432. The cubic root of 28044147 is about 303.8184042119.

The spelling of 28044147 in words is "twenty-eight million, forty-four thousand, one hundred forty-seven".