28674221 has 2 divisors, whose sum is σ = 28674222. Its totient is φ = 28674220.

The previous prime is 28674193. The next prime is 28674229. The reversal of 28674221 is 12247682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 8916196 = 4445^2 + 2986^2 .

It is a cyclic number.

It is not a de Polignac number, because 28674221 - 2⁶ = 28674157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28674229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14337110 + 14337111.

It is an arithmetic number, because the mean of its divisors is an integer number (14337111).

Almost surely, 2^28674221 is an apocalyptic number.

It is an amenable number.

28674221 is a deficient number, since it is larger than the sum of its proper divisors (1).

28674221 is an equidigital number, since it uses as much as digits as its factorization.

28674221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 28674221 is about 5354.8315566412. The cubic root of 28674221 is about 306.0768919788.

The spelling of 28674221 in words is "twenty-eight million, six hundred seventy-four thousand, two hundred twenty-one".