28779 has 8 divisors (see below), whose sum is σ = 39312. Its totient is φ = 18720.

The previous prime is 28771. The next prime is 28789. The reversal of 28779 is 97782.

28779 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 28779 - 2³ = 28771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28771) 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, 69 + ... + 249.

It is an arithmetic number, because the mean of its divisors is an integer number (4914).

2²⁸⁷⁷⁹ is an apocalyptic number.

28779 is a deficient number, since it is larger than the sum of its proper divisors (10533).

28779 is a wasteful number, since it uses less digits than its factorization.

28779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237.

The product of its digits is 7056, while the sum is 33.

The square root of 28779 is about 169.6437443586. The cubic root of 28779 is about 30.6449252536.

It can be divided in two parts, 28 and 779, that multiplied together give a palindrome (21812).

The spelling of 28779 in words is "twenty-eight thousand, seven hundred seventy-nine".