28684779 has 8 divisors (see below), whose sum is σ = 38618112. Its totient is φ = 18937320.

The previous prime is 28684759. The next prime is 28684783. The reversal of 28684779 is 97748682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28684779 - 2⁷ = 28684651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28684709) 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, 46107 + ... + 46724.

It is an arithmetic number, because the mean of its divisors is an integer number (4827264).

Almost surely, 2^28684779 is an apocalyptic number.

28684779 is a deficient number, since it is larger than the sum of its proper divisors (9933333).

28684779 is a wasteful number, since it uses less digits than its factorization.

28684779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92937.

The product of its digits is 1354752, while the sum is 51.

The square root of 28684779 is about 5355.8173045764. The cubic root of 28684779 is about 306.1144537465.

The spelling of 28684779 in words is "twenty-eight million, six hundred eighty-four thousand, seven hundred seventy-nine".