28455205 has 4 divisors (see below), whose sum is σ = 34146252. Its totient is φ = 22764160.

The previous prime is 28455199. The next prime is 28455221. The reversal of 28455205 is 50255482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50255482 = 2 ⋅25127741.

It can be written as a sum of positive squares in 2 ways, for example, as 5116644 + 23338561 = 2262^2 + 4831^2 .

It is not a de Polignac number, because 28455205 - 2³ = 28455197 is a prime.

It is a Smith number, since the sum of its digits (31) 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2845516 + ... + 2845525.

It is an arithmetic number, because the mean of its divisors is an integer number (8536563).

Almost surely, 2^28455205 is an apocalyptic number.

It is an amenable number.

28455205 is a deficient number, since it is larger than the sum of its proper divisors (5691047).

28455205 is an equidigital number, since it uses as much as digits as its factorization.

28455205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691046.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 28455205 is about 5334.3420400271. The cubic root of 28455205 is about 305.2956194984.

The spelling of 28455205 in words is "twenty-eight million, four hundred fifty-five thousand, two hundred five".