28266836825 has 12 divisors (see below), whose sum is σ = 35150182908. Its totient is φ = 22549401600.

The previous prime is 28266836803. The next prime is 28266836837. The reversal of 28266836825 is 52863866282.

It can be written as a sum of positive squares in 6 ways, for example, as 8421916441 + 19844920384 = 91771^2 + 140872^2 .

It is not a de Polignac number, because 28266836825 - 2¹⁰ = 28266835801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1592696 + ... + 1610345.

It is an arithmetic number, because the mean of its divisors is an integer number (2929181909).

Almost surely, 2^28266836825 is an apocalyptic number.

28266836825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28266836825 is a deficient number, since it is larger than the sum of its proper divisors (6883346083).

28266836825 is a wasteful number, since it uses less digits than its factorization.

28266836825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203404 (or 3203399 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 56.

The spelling of 28266836825 in words is "twenty-eight billion, two hundred sixty-six million, eight hundred thirty-six thousand, eight hundred twenty-five".