28008680825 has 6 divisors (see below), whose sum is σ = 34730764254. Its totient is φ = 22406944640.

The previous prime is 28008680789. The next prime is 28008680851. The reversal of 28008680825 is 52808680082.

It can be written as a sum of positive squares in 3 ways, for example, as 729864256 + 27278816569 = 27016^2 + 165163^2 .

It is not a de Polignac number, because 28008680825 - 2²⁸ = 27740245369 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 28008680825.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560173592 + ... + 560173641.

It is an arithmetic number, because the mean of its divisors is an integer number (5788460709).

Almost surely, 2^28008680825 is an apocalyptic number.

28008680825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28008680825 is a deficient number, since it is larger than the sum of its proper divisors (6722083429).

28008680825 is a wasteful number, since it uses less digits than its factorization.

28008680825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120347243 (or 1120347238 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 47.

The spelling of 28008680825 in words is "twenty-eight billion, eight million, six hundred eighty thousand, eight hundred twenty-five".