28705779 has 8 divisors (see below), whose sum is σ = 42527120. Its totient is φ = 19137168.

The previous prime is 28705769. The next prime is 28705819. The reversal of 28705779 is 97750782.

28705779 is a `hidden beast` number, since 2 + 8 + 70 + 577 + 9 = 666.

It is not a de Polignac number, because 28705779 - 2⁹ = 28705267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28705709) 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, 531562 + ... + 531615.

It is an arithmetic number, because the mean of its divisors is an integer number (5315890).

Almost surely, 2^28705779 is an apocalyptic number.

28705779 is a deficient number, since it is larger than the sum of its proper divisors (13821341).

28705779 is a wasteful number, since it uses less digits than its factorization.

28705779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063186 (or 1063180 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 28705779 is about 5357.7774309876. Note that the first 3 decimals coincide. The cubic root of 28705779 is about 306.1891372041.

It can be divided in two parts, 2870 and 5779, that added together give a square (8649 = 93²).

The spelling of 28705779 in words is "twenty-eight million, seven hundred five thousand, seven hundred seventy-nine".