28042229 has 2 divisors, whose sum is σ = 28042230. Its totient is φ = 28042228.

The previous prime is 28042219. The next prime is 28042243. The reversal of 28042229 is 92224082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15602500 + 12439729 = 3950^2 + 3527^2 .

It is a cyclic number.

It is not a de Polignac number, because 28042229 - 2¹⁶ = 27976693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28042219) 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 as a sum of consecutive naturals, namely, 14021114 + 14021115.

It is an arithmetic number, because the mean of its divisors is an integer number (14021115).

Almost surely, 2^28042229 is an apocalyptic number.

It is an amenable number.

28042229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28042229 is an equidigital number, since it uses as much as digits as its factorization.

28042229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28042229 is about 5295.4913841871. The cubic root of 28042229 is about 303.8114777876.

The spelling of 28042229 in words is "twenty-eight million, forty-two thousand, two hundred twenty-nine".