28006279 has 4 divisors (see below), whose sum is σ = 32007184. Its totient is φ = 24005376.

The previous prime is 28006271. The next prime is 28006283. The reversal of 28006279 is 97260082.

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

It is a cyclic number.

It is not a de Polignac number, because 28006279 - 2³ = 28006271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28006271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000442 + ... + 2000455.

It is an arithmetic number, because the mean of its divisors is an integer number (8001796).

Almost surely, 2^28006279 is an apocalyptic number.

28006279 is a deficient number, since it is larger than the sum of its proper divisors (4000905).

28006279 is an equidigital number, since it uses as much as digits as its factorization.

28006279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000904.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28006279 is about 5292.0958986020. The cubic root of 28006279 is about 303.6815939936.

The spelling of 28006279 in words is "twenty-eight million, six thousand, two hundred seventy-nine".