28163205 has 48 divisors (see below), whose sum is σ = 57732480. Its totient is φ = 12426624.

The previous prime is 28163197. The next prime is 28163243. The reversal of 28163205 is 50236182.

28163205 is a `hidden beast` number, since 28 + 1 + 632 + 0 + 5 = 666.

It is not a de Polignac number, because 28163205 - 2³ = 28163197 is a prime.

It is a super-2 number, since 2×28163205² = 1586332231744050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7594 + ... + 10676.

It is an arithmetic number, because the mean of its divisors is an integer number (1202760).

Almost surely, 2^28163205 is an apocalyptic number.

It is an amenable number.

28163205 is an abundant number, since it is smaller than the sum of its proper divisors (29569275).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28163205 is a wasteful number, since it uses less digits than its factorization.

28163205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28163205 is about 5306.9016384327. The cubic root of 28163205 is about 304.2477385278.

Adding to 28163205 its reverse (50236182), we get a palindrome (78399387).

The spelling of 28163205 in words is "twenty-eight million, one hundred sixty-three thousand, two hundred five".