28042227 has 8 divisors (see below), whose sum is σ = 41544080. Its totient is φ = 18694800.

The previous prime is 28042219. The next prime is 28042229. The reversal of 28042227 is 72224082.

It is not a de Polignac number, because 28042227 - 2³ = 28042219 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: 1038601 = 28042227 / (2 + 8 + 0 + 4 + 2 + 2 + 2 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28042227.

It is not an unprimeable number, because it can be changed into a prime (28042229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519274 + ... + 519327.

It is an arithmetic number, because the mean of its divisors is an integer number (5193010).

Almost surely, 2^28042227 is an apocalyptic number.

28042227 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28042227 is a deficient number, since it is larger than the sum of its proper divisors (13501853).

28042227 is a wasteful number, since it uses less digits than its factorization.

28042227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038610 (or 1038604 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28042227 is about 5295.4911953472. The cubic root of 28042227 is about 303.8114705649.

The spelling of 28042227 in words is "twenty-eight million, forty-two thousand, two hundred twenty-seven".