28255525805 has 16 divisors (see below), whose sum is σ = 36700204464. Its totient is φ = 20759692800.

The previous prime is 28255525787. The next prime is 28255525817. The reversal of 28255525805 is 50852555282.

It can be written as a sum of positive squares in 8 ways, for example, as 2950988329 + 25304537476 = 54323^2 + 159074^2 .

It is not a de Polignac number, because 28255525805 - 2⁶ = 28255525741 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 28255525805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1090496 + ... + 1116105.

It is an arithmetic number, because the mean of its divisors is an integer number (2293762779).

Almost surely, 2^28255525805 is an apocalyptic number.

It is an amenable number.

28255525805 is a deficient number, since it is larger than the sum of its proper divisors (8444678659).

28255525805 is a wasteful number, since it uses less digits than its factorization.

28255525805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206816.

The product of its (nonzero) digits is 1600000, while the sum is 47.

The spelling of 28255525805 in words is "twenty-eight billion, two hundred fifty-five million, five hundred twenty-five thousand, eight hundred five".