28406227 has 4 divisors (see below), whose sum is σ = 28427256. Its totient is φ = 28385200.

The previous prime is 28406207. The next prime is 28406233. The reversal of 28406227 is 72260482.

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-28406227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28406207) 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, 8338 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (7106814).

Almost surely, 2^28406227 is an apocalyptic number.

28406227 is a deficient number, since it is larger than the sum of its proper divisors (21029).

28406227 is a wasteful number, since it uses less digits than its factorization.

28406227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21028.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 28406227 is about 5329.7492436324. The cubic root of 28406227 is about 305.1203574081.

It can be divided in two parts, 284062 and 27, that added together give a square (284089 = 533²).

The spelling of 28406227 in words is "twenty-eight million, four hundred six thousand, two hundred twenty-seven".