28196279 has 4 divisors (see below), whose sum is σ = 28216776. Its totient is φ = 28175784.

The previous prime is 28196249. The next prime is 28196281. The reversal of 28196279 is 97269182.

It is a happy number.

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 28196279 - 2⁸ = 28196023 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 (28196239) 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 3 ways as a sum of consecutive naturals, for example, 8024 + ... + 10989.

It is an arithmetic number, because the mean of its divisors is an integer number (7054194).

Almost surely, 2^28196279 is an apocalyptic number.

28196279 is a deficient number, since it is larger than the sum of its proper divisors (20497).

28196279 is a wasteful number, since it uses less digits than its factorization.

28196279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20496.

The product of its digits is 108864, while the sum is 44.

The square root of 28196279 is about 5310.0168549638. The cubic root of 28196279 is about 304.3667916584.

The spelling of 28196279 in words is "twenty-eight million, one hundred ninety-six thousand, two hundred seventy-nine".