28228839 has 8 divisors (see below), whose sum is σ = 37710192. Its totient is φ = 18783360.

The previous prime is 28228831. The next prime is 28228853. The reversal of 28228839 is 93882282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28228839 - 2³ = 28228831 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28228839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228831) 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 7 ways as a sum of consecutive naturals, for example, 7074 + ... + 10319.

It is an arithmetic number, because the mean of its divisors is an integer number (4713774).

Almost surely, 2^28228839 is an apocalyptic number.

28228839 is a deficient number, since it is larger than the sum of its proper divisors (9481353).

28228839 is a wasteful number, since it uses less digits than its factorization.

28228839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17937.

The product of its digits is 110592, while the sum is 42.

The square root of 28228839 is about 5313.0818740162. The cubic root of 28228839 is about 304.4839036900.

The spelling of 28228839 in words is "twenty-eight million, two hundred twenty-eight thousand, eight hundred thirty-nine".