28108039 has 4 divisors (see below), whose sum is σ = 28119456. Its totient is φ = 28096624.

The previous prime is 28108027. The next prime is 28108051. The reversal of 28108039 is 93080182.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (28108027) and next prime (28108051).

It is a cyclic number.

It is not a de Polignac number, because 28108039 - 2¹¹ = 28105991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28108039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28108019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319 + ... + 7504.

It is an arithmetic number, because the mean of its divisors is an integer number (7029864).

Almost surely, 2^28108039 is an apocalyptic number.

28108039 is a deficient number, since it is larger than the sum of its proper divisors (11417).

28108039 is an equidigital number, since it uses as much as digits as its factorization.

28108039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11416.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 28108039 is about 5301.7015193238. The cubic root of 28108039 is about 304.0489554989.

The spelling of 28108039 in words is "twenty-eight million, one hundred eight thousand, thirty-nine".