28281642875 has 16 divisors (see below), whose sum is σ = 36116322528. Its totient is φ = 22099140000.

The previous prime is 28281642869. The next prime is 28281642887. The reversal of 28281642875 is 57824618282.

It is a happy number.

It is not a de Polignac number, because 28281642875 - 2³² = 23986675579 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2625476 + ... + 2636225.

It is an arithmetic number, because the mean of its divisors is an integer number (2257270158).

Almost surely, 2^28281642875 is an apocalyptic number.

28281642875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28281642875 is a deficient number, since it is larger than the sum of its proper divisors (7834679653).

28281642875 is an equidigital number, since it uses as much as digits as its factorization.

28281642875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261759 (or 5261749 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 53.

The spelling of 28281642875 in words is "twenty-eight billion, two hundred eighty-one million, six hundred forty-two thousand, eight hundred seventy-five".