28078339 has 4 divisors (see below), whose sum is σ = 29730024. Its totient is φ = 26426656.

The previous prime is 28078327. The next prime is 28078367. The reversal of 28078339 is 93387082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93387082 = 2 ⋅46693541.

It is a cyclic number.

It is not a de Polignac number, because 28078339 - 2⁵ = 28078307 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825817 + ... + 825850.

It is an arithmetic number, because the mean of its divisors is an integer number (7432506).

Almost surely, 2^28078339 is an apocalyptic number.

28078339 is a deficient number, since it is larger than the sum of its proper divisors (1651685).

28078339 is a wasteful number, since it uses less digits than its factorization.

28078339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651684.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28078339 is about 5298.8997914661. The cubic root of 28078339 is about 303.9418279447.

The spelling of 28078339 in words is "twenty-eight million, seventy-eight thousand, three hundred thirty-nine".