28315821875 has 48 divisors (see below), whose sum is σ = 39102497280. Its totient is φ = 20330700000.

The previous prime is 28315821839. The next prime is 28315821881. The reversal of 28315821875 is 57812851382.

It is a happy number.

It is not a de Polignac number, because 28315821875 - 2¹⁰ = 28315820851 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2710412 + ... + 2720838.

It is an arithmetic number, because the mean of its divisors is an integer number (814635360).

Almost surely, 2^28315821875 is an apocalyptic number.

28315821875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28315821875 is a deficient number, since it is larger than the sum of its proper divisors (10786675405).

28315821875 is an equidigital number, since it uses as much as digits as its factorization.

28315821875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10542 (or 10522 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 50.

The spelling of 28315821875 in words is "twenty-eight billion, three hundred fifteen million, eight hundred twenty-one thousand, eight hundred seventy-five".