28184321257 has 2 divisors, whose sum is σ = 28184321258. Its totient is φ = 28184321256.

The previous prime is 28184321183. The next prime is 28184321273. The reversal of 28184321257 is 75212348182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27123125481 + 1061195776 = 164691^2 + 32576^2 .

It is a cyclic number.

It is not a de Polignac number, because 28184321257 - 2³¹ = 26036837609 is a prime.

It is not a weakly prime, because it can be changed into another prime (28184321287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14092160628 + 14092160629.

It is an arithmetic number, because the mean of its divisors is an integer number (14092160629).

Almost surely, 2^28184321257 is an apocalyptic number.

It is an amenable number.

28184321257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28184321257 is an equidigital number, since it uses as much as digits as its factorization.

28184321257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 43.

The spelling of 28184321257 in words is "twenty-eight billion, one hundred eighty-four million, three hundred twenty-one thousand, two hundred fifty-seven".