28120779 has 12 divisors (see below), whose sum is σ = 42757000. Its totient is φ = 17760384.

The previous prime is 28120759. The next prime is 28120811. The reversal of 28120779 is 97702182.

It is not a de Polignac number, because 28120779 - 2⁵ = 28120747 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 (28120759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82054 + ... + 82395.

Almost surely, 2^28120779 is an apocalyptic number.

28120779 is a deficient number, since it is larger than the sum of its proper divisors (14636221).

28120779 is a wasteful number, since it uses less digits than its factorization.

28120779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164474 (or 164471 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28120779 is about 5302.9028842701. The cubic root of 28120779 is about 304.0948854029.

The spelling of 28120779 in words is "twenty-eight million, one hundred twenty thousand, seven hundred seventy-nine".