28986779 has 6 divisors (see below), whose sum is σ = 29192436. Its totient is φ = 28782540.

The previous prime is 28986743. The next prime is 28986781. The reversal of 28986779 is 97768982.

It is not a de Polignac number, because 28986779 - 2²⁴ = 12209563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28986709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26024 + ... + 27114.

It is an arithmetic number, because the mean of its divisors is an integer number (4865406).

Almost surely, 2^28986779 is an apocalyptic number.

28986779 is a deficient number, since it is larger than the sum of its proper divisors (205657).

28986779 is an equidigital number, since it uses as much as digits as its factorization.

28986779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417 (or 1254 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 56.

The square root of 28986779 is about 5383.9371281619. The cubic root of 28986779 is about 307.1849868502.

The spelling of 28986779 in words is "twenty-eight million, nine hundred eighty-six thousand, seven hundred seventy-nine".