28115272 has 8 divisors (see below), whose sum is σ = 52716150. Its totient is φ = 14057632.

The previous prime is 28115267. The next prime is 28115279. The reversal of 28115272 is 27251182.

It can be written as a sum of positive squares in only one way, i.e., 23561316 + 4553956 = 4854^2 + 2134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28115272.

It is not an unprimeable number, because it can be changed into a prime (28115279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1757197 + ... + 1757212.

Almost surely, 2^28115272 is an apocalyptic number.

It is an amenable number.

28115272 is a deficient number, since it is larger than the sum of its proper divisors (24600878).

28115272 is a wasteful number, since it uses less digits than its factorization.

28115272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514415 (or 3514411 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 28115272 is about 5302.3836149415. The cubic root of 28115272 is about 304.0750334178.

The spelling of 28115272 in words is "twenty-eight million, one hundred fifteen thousand, two hundred seventy-two".