28042779 has 4 divisors (see below), whose sum is σ = 37390376. Its totient is φ = 18695184.

The previous prime is 28042733. The next prime is 28042787. The reversal of 28042779 is 97724082.

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

It is not a de Polignac number, because 28042779 - 2¹² = 28038683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28042789) 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, 4673794 + ... + 4673799.

It is an arithmetic number, because the mean of its divisors is an integer number (9347594).

Almost surely, 2^28042779 is an apocalyptic number.

28042779 is a deficient number, since it is larger than the sum of its proper divisors (9347597).

28042779 is an equidigital number, since it uses as much as digits as its factorization.

28042779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9347596.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 28042779 is about 5295.5433149017. The cubic root of 28042779 is about 303.8134640208.

The spelling of 28042779 in words is "twenty-eight million, forty-two thousand, seven hundred seventy-nine".