28708684929 has 20 divisors (see below), whose sum is σ = 42967876336. Its totient is φ = 19102500216.

The previous prime is 28708684909. The next prime is 28708684951. The reversal of 28708684929 is 92948680782.

28708684929 is a `hidden beast` number, since 2 + 87 + 0 + 8 + 68 + 492 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28708684929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28708684909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 296479 + ... + 381204.

Almost surely, 2^28708684929 is an apocalyptic number.

It is an amenable number.

28708684929 is a deficient number, since it is larger than the sum of its proper divisors (14259191407).

28708684929 is an equidigital number, since it uses as much as digits as its factorization.

28708684929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678218 (or 678209 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 28708684929 in words is "twenty-eight billion, seven hundred eight million, six hundred eighty-four thousand, nine hundred twenty-nine".