28638680875 has 24 divisors (see below), whose sum is σ = 41576359968. Its totient is φ = 19637948400.

The previous prime is 28638680849. The next prime is 28638680887. The reversal of 28638680875 is 57808683682.

It is not a de Polignac number, because 28638680875 - 2⁵ = 28638680843 is a prime.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2331727 + ... + 2343976.

It is an arithmetic number, because the mean of its divisors is an integer number (1732348332).

Almost surely, 2^28638680875 is an apocalyptic number.

28638680875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28638680875 is a deficient number, since it is larger than the sum of its proper divisors (12937679093).

28638680875 is an equidigital number, since it uses as much as digits as its factorization.

28638680875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675732 (or 4675715 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 28638680875 in words is "twenty-eight billion, six hundred thirty-eight million, six hundred eighty thousand, eight hundred seventy-five".