28761223 has 2 divisors, whose sum is σ = 28761224. Its totient is φ = 28761222.

The previous prime is 28761209. The next prime is 28761233. The reversal of 28761223 is 32216782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28761223 - 2⁵ = 28761191 is a prime.

It is equal to p_1785811 and since 28761223 and 1785811 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28761233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14380611 + 14380612.

It is an arithmetic number, because the mean of its divisors is an integer number (14380612).

Almost surely, 2^28761223 is an apocalyptic number.

28761223 is a deficient number, since it is larger than the sum of its proper divisors (1).

28761223 is an equidigital number, since it uses as much as digits as its factorization.

28761223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 28761223 is about 5362.9490954138. The cubic root of 28761223 is about 306.3861408868.

The spelling of 28761223 in words is "twenty-eight million, seven hundred sixty-one thousand, two hundred twenty-three".