28155274 has 32 divisors (see below), whose sum is σ = 49900032. Its totient is φ = 11664000.

The previous prime is 28155271. The next prime is 28155299. The reversal of 28155274 is 47255182.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28155271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103759 + ... + 104029.

It is an arithmetic number, because the mean of its divisors is an integer number (1559376).

Almost surely, 2^28155274 is an apocalyptic number.

28155274 is a deficient number, since it is larger than the sum of its proper divisors (21744758).

28155274 is a wasteful number, since it uses less digits than its factorization.

28155274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its digits is 22400, while the sum is 34.

The square root of 28155274 is about 5306.1543513170. The cubic root of 28155274 is about 304.2191762559.

It can be divided in two parts, 281 and 55274, that added together give a palindrome (55555).

The spelling of 28155274 in words is "twenty-eight million, one hundred fifty-five thousand, two hundred seventy-four".