28722274 has 16 divisors (see below), whose sum is σ = 49617216. Its totient is φ = 12214800.

The previous prime is 28722251. The next prime is 28722289. The reversal of 28722274 is 47222782.

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 7 ways as a sum of consecutive naturals, for example, 5997 + ... + 9664.

It is an arithmetic number, because the mean of its divisors is an integer number (3101076).

Almost surely, 2^28722274 is an apocalyptic number.

28722274 is a deficient number, since it is larger than the sum of its proper divisors (20894942).

28722274 is a wasteful number, since it uses less digits than its factorization.

28722274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15801.

The product of its digits is 25088, while the sum is 34.

The square root of 28722274 is about 5359.3165609059. The cubic root of 28722274 is about 306.2477737447.

It can be divided in two parts, 287222 and 74, that added together give a square (287296 = 536²).

The spelling of 28722274 in words is "twenty-eight million, seven hundred twenty-two thousand, two hundred seventy-four".