28204855285 has 4 divisors (see below), whose sum is σ = 33845826348. Its totient is φ = 22563884224.

The previous prime is 28204855267. The next prime is 28204855291. The reversal of 28204855285 is 58255840282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6642576004 + 21562279281 = 81502^2 + 146841^2 .

It is a cyclic number.

It is not a de Polignac number, because 28204855285 - 2¹⁹ = 28204330997 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2820485524 + ... + 2820485533.

It is an arithmetic number, because the mean of its divisors is an integer number (8461456587).

Almost surely, 2^28204855285 is an apocalyptic number.

It is an amenable number.

28204855285 is a deficient number, since it is larger than the sum of its proper divisors (5640971063).

28204855285 is an equidigital number, since it uses as much as digits as its factorization.

28204855285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5640971062.

The product of its (nonzero) digits is 2048000, while the sum is 49.

The spelling of 28204855285 in words is "twenty-eight billion, two hundred four million, eight hundred fifty-five thousand, two hundred eighty-five".