28605633425 has 12 divisors (see below), whose sum is σ = 35483235996. Its totient is φ = 22876603200.

The previous prime is 28605633401. The next prime is 28605633443. The reversal of 28605633425 is 52433650682.

It is a Cunningham number, because it is equal to 169132²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 39225169 + 28566408256 = 6263^2 + 169016^2 .

It is not a de Polignac number, because 28605633425 - 2²⁶ = 28538524561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123206 + ... + 269055.

It is an arithmetic number, because the mean of its divisors is an integer number (2956936333).

Almost surely, 2^28605633425 is an apocalyptic number.

28605633425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28605633425 is a deficient number, since it is larger than the sum of its proper divisors (6877602571).

28605633425 is a wasteful number, since it uses less digits than its factorization.

28605633425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395188 (or 395183 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 28605633425 in words is "twenty-eight billion, six hundred five million, six hundred thirty-three thousand, four hundred twenty-five".