28078939 has 8 divisors (see below), whose sum is σ = 32530400. Its totient is φ = 23737536.

The previous prime is 28078937. The next prime is 28078943. The reversal of 28078939 is 93987082.

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

It is a cyclic number.

It is not a de Polignac number, because 28078939 - 2¹ = 28078937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28078937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26964 + ... + 27985.

It is an arithmetic number, because the mean of its divisors is an integer number (4066300).

Almost surely, 2^28078939 is an apocalyptic number.

28078939 is a deficient number, since it is larger than the sum of its proper divisors (4451461).

28078939 is an equidigital number, since it uses as much as digits as its factorization.

28078939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55029.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 28078939 is about 5298.9564066899. The cubic root of 28078939 is about 303.9439928851.

The spelling of 28078939 in words is "twenty-eight million, seventy-eight thousand, nine hundred thirty-nine".