28108779 has 4 divisors (see below), whose sum is σ = 37478376. Its totient is φ = 18739184.

The previous prime is 28108777. The next prime is 28108807. The reversal of 28108779 is 97780182.

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 28108779 - 2¹ = 28108777 is a prime.

It is a super-6 number, since 6×28108779⁶ (a number of 46 digits) contains 666666 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28108779.

It is not an unprimeable number, because it can be changed into a prime (28108777) 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, 4684794 + ... + 4684799.

It is an arithmetic number, because the mean of its divisors is an integer number (9369594).

Almost surely, 2^28108779 is an apocalyptic number.

28108779 is a deficient number, since it is larger than the sum of its proper divisors (9369597).

28108779 is an equidigital number, since it uses as much as digits as its factorization.

28108779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9369596.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 28108779 is about 5301.7713077801. The cubic root of 28108779 is about 304.0516237065.

The spelling of 28108779 in words is "twenty-eight million, one hundred eight thousand, seven hundred seventy-nine".