28312227 has 8 divisors (see below), whose sum is σ = 41944080. Its totient is φ = 18874800.

The previous prime is 28312211. The next prime is 28312231. The reversal of 28312227 is 72221382.

It is a happy number.

It is not a de Polignac number, because 28312227 - 2⁴ = 28312211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1048601 = 28312227 / (2 + 8 + 3 + 1 + 2 + 2 + 2 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 28312227.

It is not an unprimeable number, because it can be changed into a prime (28312267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524274 + ... + 524327.

It is an arithmetic number, because the mean of its divisors is an integer number (5243010).

Almost surely, 2^28312227 is an apocalyptic number.

28312227 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28312227 is a deficient number, since it is larger than the sum of its proper divisors (13631853).

28312227 is a wasteful number, since it uses less digits than its factorization.

28312227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048610 (or 1048604 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28312227 is about 5320.9235100685. The cubic root of 28312227 is about 304.7834241404.

The spelling of 28312227 in words is "twenty-eight million, three hundred twelve thousand, two hundred twenty-seven".