28911279 has 4 divisors (see below), whose sum is σ = 38548376. Its totient is φ = 19274184.

The previous prime is 28911263. The next prime is 28911283. The reversal of 28911279 is 97211982.

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

It is not a de Polignac number, because 28911279 - 2⁴ = 28911263 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 (28913279) 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, 4818544 + ... + 4818549.

It is an arithmetic number, because the mean of its divisors is an integer number (9637094).

Almost surely, 2^28911279 is an apocalyptic number.

28911279 is a deficient number, since it is larger than the sum of its proper divisors (9637097).

28911279 is an equidigital number, since it uses as much as digits as its factorization.

28911279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9637096.

The product of its digits is 18144, while the sum is 39.

The square root of 28911279 is about 5376.9209590620. The cubic root of 28911279 is about 306.9180532978.

The spelling of 28911279 in words is "twenty-eight million, nine hundred eleven thousand, two hundred seventy-nine".