28127205 has 24 divisors (see below), whose sum is σ = 49049208. Its totient is φ = 14910336.

The previous prime is 28127191. The next prime is 28127207. The reversal of 28127205 is 50272182.

It can be written as a sum of positive squares in 4 ways, for example, as 910116 + 27217089 = 954^2 + 5217^2 .

It is not a de Polignac number, because 28127205 - 2⁸ = 28126949 is a prime.

It is a super-2 number, since 2×28127205² = 1582279322224050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28127207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5979 + ... + 9591.

It is an arithmetic number, because the mean of its divisors is an integer number (2043717).

Almost surely, 2^28127205 is an apocalyptic number.

It is an amenable number.

28127205 is a deficient number, since it is larger than the sum of its proper divisors (20922003).

28127205 is a wasteful number, since it uses less digits than its factorization.

28127205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797 (or 3794 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28127205 is about 5303.5087442183. The cubic root of 28127205 is about 304.1180469816.

Adding to 28127205 its reverse (50272182), we get a palindrome (78399387).

The spelling of 28127205 in words is "twenty-eight million, one hundred twenty-seven thousand, two hundred five".