28776278875 has 8 divisors (see below), whose sum is σ = 35912796192. Its totient is φ = 23021023000.

The previous prime is 28776278863. The next prime is 28776278911. The reversal of 28776278875 is 57887267782.

It is not a de Polignac number, because 28776278875 - 2¹¹ = 28776276827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28776278875.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115104991 + ... + 115105240.

It is an arithmetic number, because the mean of its divisors is an integer number (4489099524).

Almost surely, 2^28776278875 is an apocalyptic number.

28776278875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28776278875 is a deficient number, since it is larger than the sum of its proper divisors (7136517317).

28776278875 is an equidigital number, since it uses as much as digits as its factorization.

28776278875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230210246 (or 230210236 counting only the distinct ones).

The product of its digits is 147517440, while the sum is 67.

The spelling of 28776278875 in words is "twenty-eight billion, seven hundred seventy-six million, two hundred seventy-eight thousand, eight hundred seventy-five".