28154227 has 4 divisors (see below), whose sum is σ = 29810376. Its totient is φ = 26498080.

The previous prime is 28154197. The next prime is 28154237. The reversal of 28154227 is 72245182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28154227 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28154237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828049 + ... + 828082.

It is an arithmetic number, because the mean of its divisors is an integer number (7452594).

Almost surely, 2^28154227 is an apocalyptic number.

28154227 is a deficient number, since it is larger than the sum of its proper divisors (1656149).

28154227 is a wasteful number, since it uses less digits than its factorization.

28154227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656148.

The product of its digits is 8960, while the sum is 31.

The square root of 28154227 is about 5306.0556913775. The cubic root of 28154227 is about 304.2154052463.

The spelling of 28154227 in words is "twenty-eight million, one hundred fifty-four thousand, two hundred twenty-seven".